verb (used with object)
to increase in extent, size, volume, scope, etc.: Heat expands most metals. He hopes to expand his company.
to spread or stretch out; unfold: A bird expands its wings.
to express in fuller form or greater detail; develop: to expand a short story into a novel.
to write (a mathematical expression) so as to show the products of its factors. Compare factor ( def 10 ).
to rewrite (a mathematical expression) as a sum, product, etc., of terms of a particular kind: to expand a function in a power series.
verb (used without object)
to increase or grow in extent, bulk, scope, etc.: Most metals expand with heat. The mind expands with experience.
to spread out; unfold; develop: The buds had not yet expanded.
to express something more fully or in greater detail (usually followed by on or upon ): to expand on a statement.

1400–50; late Middle English expanden < Latin expandere to spread out, equivalent to ex- ex-1 + pandere to extend, stretch

expandable, expandible, adjective
expandability, expandibility, noun
nonexpanding, adjective
overexpand, verb
preexpand, verb (used with object)
reexpand, verb
self-expanding, adjective
superexpand, verb
unexpandable, adjective
unexpanding, adjective

expand, expend (see synonym study at the current entry).

1. extend, swell, enlarge. See increase, Expand, dilate, distend, inflate imply becoming larger and filling more space. To expand is to spread out, usually in every direction: to expand one's chest. To dilate is especially to increase the width or circumference, and applies to space enclosed within confines or to hollow bodies: to dilate the pupils of the eyes. To distend is to stretch, often beyond the point of natural expansion: to distend an artery. To inflate is to blow out or swell a hollow body with air or gas: to inflate a balloon.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expand (ɪkˈspænd)
vb (often foll by on)
1.  to make or become greater in extent, volume, size, or scope; increase
2.  to spread out or be spread out; unfold; stretch out
3.  to enlarge or expatiate on (a story, topic, etc) in detail
4.  (intr) to become increasingly relaxed, friendly, or talkative
5.  maths to express (a function or expression) as the sum or product of terms
[C15: from Latin expandere to spread out, from pandere to spread, extend]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 15c., "spread out, spread flat," from Anglo-Fr. espaundre, from L. expandere "to spread out," from ex- "out" + pandere "to spread." Sense of "grow larger" first recorded 1640s. Related: Expanded; expanding.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for expands
In the same chapter also expands on the role of helminths in disease.
As a result, their crystal structure expands slightly and over time.
This force has two opposing elements heat, which expands, and cold, which contracts.
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