Definition of a- in English:

a-

prefix

1To; towards: aside ashore
1.1In the process of (an activity): a-hunting
1.2In a specified state: aflutter
1.3On: afoot
1.4In: nowadays

Origin

Old English, unstressed form of on.

Definition of a- in:

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Word of the day bimble
Pronunciation: ˈbɪmb(ə)l
verb
walk or travel at a leisurely pace