Find out what a sign means with these Great ASL Dictionary apps

This is a modification for younger users of the popular ASL Video Dictionary and Inflection Guide from National Technical Institute for the Deaf. It does NOT include the Socially Restricted and Substance Abuse signs that many parents and school officials view as inappropriate for children and teenagers.

The program shows 2,700 signs and 650 sentences that demonstrate how signs change, or “inflect”, to convey different meanings. For example, modifications in hand movements and facial expressions can change the sign for “help” to mean help me, help them, help for a long time, etc. “Afternoon” can change to mean all afternoon, late afternoon or every afternoon. The sentences also show the full range of ASL grammar.

There is an option to show signs grouped into 24 categories: Countries, Animals, Numbers, States, Money, etc. As a self-test, users also have an option to choose when they see the English sentences – simultaneously with the ASL sentences, or afterwards.

The Signing Math Picture Dictionary (SMP) is an illustrated, interactive 3D sign language dictionary with 563 math terms defined in both American Sign Language (ASL) and Signed English (SE). The SMP is one in a series of fully animated, illustrated, and interactive 3D signing dictionaries. The SMP is designed for grade K-4 students who are deaf or hard-of-hearing and use American Sign Language (ASL) or Signed English (SE) in the classroom.

The SMP supports access to standards-based math content among lower grade elementary students and is a great resource for teachers and parents!

The SMP will link to definitions in our Signing Math Dictionary, Signing Science Dictionary, and Signing Science Picture Dictionary, all three of which can be found on iTunes.

Our 3D character, or avatar, can be zoomed in or out and rotated to give you the best vantage point for every sign. YOU the user have full control of the placement of the character!

Use the controls to choose the character and type of sign language you prefer; view the illustration; speed up or slow down the signing; and send the character to his or her "home" or default position. The signing will automatically loop until you go back (using the "back" arrow in the top left corner), thereby exiting from the signing page.

The SMP also features an audio version of the dictionary pages. You can click on the sound icons and hear each part of the text spoken clearly as you read along.

Use the Quick Start Guide in the app to walk you through what the SMP has to offer. For a full description of how to use the SMP, go to www.signingapp.com.

Text and illustrations were developed by and are copyrighted by TERC, Cambridge, Massachusetts. All rights reserved. SigningAvatar® animation technology and mobile interface were designed, developed, and are copyrighted by Vcom3D, Inc. All rights reserved. The audio component was developed and recorded by Bridge Multimedia in New York City. Any reproduction in whole or in part is strictly prohibited.

The Signing Math Picture Dictionary for iPod Touch/iPhone is developed by TERC and Vcom3D and funded in part by the U.S. Department of Education, Grant Award Numbers H327A100074 and H133S120066.

The Signing Earth Science Dictionary (SESD) is an interactive 3D sign language dictionary designed for students in grades 7-12 who are deaf or hard of hearing and studying Earth and space science content. It is also intended to serve as a resource for teachers and other professionals who work with them. The SESD is one in a series of fully animated, illustrated and Interactive 3D signing dictionaries designed for students who use ASL or SE for communication.

The SESD supports access to standards-based Earth and space science content among middle and high school students and is a great resource for teachers and parents!

Our 3D character can be zoomed in or out and rotated to give you the best vantage point for every sign. YOU control the placement of the character - not us!

Use the controls to choose the sign language you prefer; view the illustration; speed up or slow down the signing; and send the character to his "home" or default position. The signing will automatically loop until you go back (using the "back" arrow in the top left corner), thereby exiting from the signing page.

Use the Quick Start Guide in the app to walk you through what the SESD has to offer. For a full description of how to use the SESD, go to www.siginingapp.com.

Text and illustrations were developed by and are copyrighted by TERC, Cambridge, Massachusetts. ©TERC, Inc. All rights reserved. SigningAvatar® animation technology and mobile interface were designed, developed and are copyrighted by Vcom3D, Inc. ©Vcom3D, Inc. All rights reserved. Any reproduction in whole or in part is strictly prohibited.

The Signing Earth Science Dictionary for iPod Touch/iPhone/iPad is developed by TERC and Vcom3D and funded in part by the National Science Foundation, Grant # GEO-0913675. All opinions, findings, conclusions, and recommendations expressed herein are those of the authors and do not necessarily reflect the views of the funders.

The Signing Physical Science Dictionary (SPSD) is an interactive 3D sign language dictionary designed for students in grades 7-12 who are deaf or hard of hearing and studying physical science content. It is also intended to serve as a resource for teachers and other professionals who work with them. The SPSD is one in a series of fully animated, illustrated and Interactive 3D signing dictionaries designed for students who use ASL or SE for communication.

The SPSD supports access to standards-based physical science content among middle and high school students and is a great resource for teachers and parents!

Our 3D character can be zoomed in or out and rotated to give you the best vantage point for every sign. YOU control the placement of the character - not us!

Use the controls to choose the sign language you prefer; view the illustration; speed up or slow down the signing; and send the character to his "home" or default position. The signing will automatically loop until you go back (using the "back" arrow in the top left corner), thereby exiting from the signing page.

Use the Quick Start Guide in the app to walk you through what the SPSD has to offer. For a full description of how to use the SPSD, go to www.siginingapp.com.

Soon to be available in this series is Diccionario de Senas de las Ciencias Físicas (DSCF). DSCF and SPSD are intended for use together. You can link from each English page in SPSD to a corresponding page in DSCF with Spanish translations of all of its components and all of the illustrated interactive 3D features. The DSCF can be found on iTunes.

The SPSD will also link to definitions in our Signing Life Science Dictionary (SLSD). The SLSD can be found on iTunes

Text and illustrations were developed by and are copyrighted by TERC, Cambridge, Massachusetts. ©TERC, Inc. All rights reserved. SigningAvatar® animation technology and mobile interface were designed, developed and are copyrighted by Vcom3D, Inc. ©Vcom3D, Inc. All rights reserved. Any reproduction in whole or in part is strictly prohibited.

The Signing Physical Science Dictionary for iPod Touch/iPhone/iPad is developed by TERC and Vcom3D and funded in part by the National Science Foundation, Grant #DRL-1019542. All opinions, findings, conclusions, and recommendations expressed herein are those of the authors and do not necessarily reflect the views of the funders.

The Signing Life Science Dictionary (SLSD) is an interactive 3D sign language dictionary designed for students in grades 7-12 who are deaf or hard of hearing and studying life science content. It is also intended to serve as a resource for teachers and other professionals who work with them. The SLSD is one in a series of fully animated, illustrated and Interactive 3D signing dictionaries designed for students who use ASL or SE for communication.

The SLSD supports access to standards-based life science content among middle and high school students and is a great resource for teachers and parents!

Our 3D character can be zoomed in or out and rotated to give you the best vantage point for every sign. YOU control the placement of the character - not us!

Use the controls to choose the sign language you prefer; view the illustration; speed up or slow down the signing; and send the character to his "home" or default position. The signing will automatically loop until you go back (using the "back" arrow in the top left corner), thereby exiting from the signing page.

Use the Quick Start Guide in the app to walk you through what the SLSD has to offer. For a full description of how to use the SLSD, go to www.siginingapp.com.

Soon to be available in this series is Diccionario de Señas de Ciencias de la Vida (DSCV). DSCV and SLSD are intended for use together. You can link from each English page in SLSD to a corresponding page in DSCV with Spanish translations of all of its components and all of the illustrated interactive 3D features. The DSCV can be found on iTunes.

The SLSD will also link to definitions in our Signing Physical Science Dictionary (SPSD). The SPSD can be found on iTunes

Text and illustrations were developed by and are copyrighted by TERC, Cambridge, Massachusetts. ©TERC, Inc. All rights reserved. SigningAvatar® animation technology and mobile interface were designed, developed and are copyrighted by Vcom3D, Inc. ©Vcom3D, Inc. All rights reserved. Any reproduction in whole or in part is strictly prohibited.

The Signing Life Science Dictionary for iPod Touch/iPhone/iPad is developed by TERC and Vcom3D and funded in part by the National Science Foundation, Grant #DRL-1019542. All opinions, findings, conclusions, and recommendations expressed herein are those of the authors and do not necessarily reflect the views of the funders.

The Signing Math Dictionary (SMD) is an illustrated, interactive 3D sign language dictionary with 705 math terms defined in both American Sign Language (ASL) and Signed English (SE).

The SMD is one in a series of fully animated, illustrated and interactive 3D signing dictionaries. The SMD is designed for grade 4-8 students who are Deaf or Hard-of-Hearing and use ASL or SE in the classroom.

The SMD supports access to standards-based math content among elementary and middle school students and is a great resource for teachers and parents!

The SMD will link to definitions in our Signing Science Dictionary and Signing Science Pictionary which can be found on iTunes.

Our 3D character can be zoomed in or out and rotated to give you the best vantage point for every sign. YOU control the placement of the character – not us!

Use the controls to choose the sign language you prefer; view the illustration; speed up or slow down the signing; and send the character to his "home" or default position. The signing will automatically loop until you go back (using the "back" arrow in the top left corner), thereby exiting from the signing page.

Use the Quick Start Guide in the app to walk you through what the SMD has to offer. For a full description of how to use the SMD, go to www.signingapp.com.


Text and illustrations were developed by and are copyrighted by TERC, Cambridge, Massachusetts. ©TERC, Inc. All rights reserved. SigningAvatar® animation technology and mobile interface were designed, developed and are copyrighted by Vcom3D, Inc. ©Vcom3D, Inc. All rights reserved. Any reproduction in while or in part is strictly prohibited.

The Signing Math Dictionary for iPod Touch/iPhone is developed by TERC and Vcom3D and funded in part by the National Science Foundation, Grant #HRD-0833969. All opinions, findings, conclusions, and recommendations expressed herein are those of the authors and do not necessarily reflect the views of the funders.