Definition of a- in English:

a-2

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.

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Word of the day middlescent
Pronunciation: ˌmɪdəˈlɛs(ə)nt
adjective
middle-aged, but still maintaining youthful interests and activities