Definition of after:

part of speech: conjunction

When- as, you will come to me after he has seen you.

part of speech: adjective

Later in time- as, it is an after thought.

part of speech: adverb

At a later time.

part of speech: preposition

Behind; later- as, he went home after dinner.

Usage examples:

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A making equal; in alg., a proposition asserting the equality of two quantities, having the sign = ( equal to) placed between them. ...