erstwhile

The definition of erstwhile is something from an earlier time.

(adjective)

An example of something erstwhile is a girl who was your best friend as a child.

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See erstwhile in Webster's New World College Dictionary

adverb

Archaic some time ago; formerly

adjective

of an earlier time; former: my erstwhile friend

See erstwhile in American Heritage Dictionary 4

adverb
In the past; at a former time; formerly.
adjective
Former: our erstwhile companions.

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