Collins Concise English Dictionary © HarperCollins Publishers::

a-, (before a vowel)an- prefix
  1. not; without; opposite to: atonal, asocial
Etymology: from Greek a-, an- not, without
a- prefix
  1. on; in; towards: afoot, abed, aground, aback
  2. in the condition or state of: afloat, alive, asleep

an-, (before a consonant)a- prefix
  1. not; without: anaphrodisiac
Etymology: from Greek

'a-' also found in these entries:

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