#1 expansion n. [enlargement] the act of increasing (something) in size or volume or quantity or scope. wn
#2 expansion n. a function expressed as a sum or product of terms; "the expansion of (a+b)^2 is a^2 + 2ab + b^2". wn
#3 expansion n. [enlargement, elaboration] a discussion that provides additional information. wn
#4 expansion n. [expanding upon] adding information or detail. wn
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