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expansion (n.)

1610s, "anything spread out;" 1640s, "act of expanding," from French expansion, from Late Latin expansionem (nominative expansio) "a spreading out," noun of action from past-participle stem of Latin expandere "to spread out, unfold, expand," from ex "out" (see ex-) + pandere "to spread, stretch" (from nasalized form of PIE root *pete- "to spread").

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Definitions of expansion

expansion (n.)
the act of increasing (something) in size or volume or quantity or scope;
Synonyms: enlargement
expansion (n.)
a function expressed as a sum or product of terms;
the expansion of (a+b)^2 is a^2 + 2ab + b^2
expansion (n.)
a discussion that provides additional information;
expansion (n.)
adding information or detail;
Synonyms: expanding upon
From wordnet.princeton.edu