A-

A- A, as a prefix to English words, is derived from various sources. (1) It frequently signifies on or in (from an , a forms of Anglo-Saxon on ), denoting a state, as in a foot, on foot, a bed, a miss, a sleep, aground, a loft, a way (AS. on...
Found on http://www.encyclo.co.uk/webster/A/1

A-

• A, as a prefix to English words, is derived from various sources. (1) It frequently signifies on or in (from an, a forms of AS. on), denoting a state, as in afoot, on foot, abed, amiss, asleep, aground, aloft, away (AS. onweg), and analogically, ablaze, atremble, etc. (2) AS. of off, from, as in adown (AS. ofd/ne off the dun or hill). (3)......
Found on http://thinkexist.com/dictionary/meaning/a-/

A-

A- is the US Navy designation for attack aircraft. The designation was first introduced in 1964.
Found on http://www.probertencyclopaedia.com/browse/IA.HTM

a-

Type: Term Definitions: 1. Not, without, -less; equivalent to L. in- and E. un-.
Found on http://www.medilexicon.com/medicaldictionary.php?t=10
No exact match found