variant of ad- before t: attend.
A Look At American Sign LanguageWhat is ASL or American Sign Language? American Sign Language, or ASL, is the visual signing language used by the Deaf community in the United States. English speakers in Canada and in a handful of other counties use ASL, too. Interestingly, those countries include the Philippines, Singapore, Jamaica, China, Chad, the Democratic Republic of the Congo, Cambodia, and Bolivia—a varied group. There are other sign languages …
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Word Origin and History for at-
assimilated form of ad- "to, toward, before" before stems beginning in -t-; see ad-.
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for at-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.