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dilate (v.)

late 14c., dilaten, "describe at length, speak at length," from Old French dilater and directly from Late Latin dilatare "make wider, enlarge," from dis- "apart" (see dis-) + lātus "broad, wide, widespread, extended" (see latitude). Meaning "expand, distend, spread out, enlarge in all directions" (transitive) is from early 15c.; intransitive sense of "spread out, expand, distend" also is from early 15c.  A doublet of delay. Related: Dilated; dilating.

Origin and meaning of dilate

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Definitions of dilate from WordNet

dilate (v.)
become wider;
His pupils were dilated
Synonyms: distend
dilate (v.)
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing;
Synonyms: elaborate / lucubrate / expatiate / exposit / enlarge / flesh out / expand / expound
From wordnet.princeton.edu