Definition of expansion:

part of speech: noun

Act of expanding; dilation; extent.

part of speech: noun

Act of expanding: state of being expanded: enlargement: that which is expanded: immensity.

part of speech: noun

The act of spreading out; the state of being stretched out; increase in size.

Usage examples for expansion:

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To cut or shave off the outside or ends of; as, to pare an apple; to cut away little by little; reduce. ...