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The Collaborative International Dictionary
Interpunction

Interpunction \In`ter*punc"tion\, n. [L. interpunctio, fr. interpungere, interppunctum, to interpoint. See Inter-, and Point.] The insertion of points between words or sentences; punctuation.

Douglas Harper's Etymology Dictionary
interpunction

"punctuation," 1610s, from Latin interpunctionem (nominative interpunctio) "a putting of points between," noun of action from past participle stem of interpungere "to put points between," from inter- (see inter-) + pungere (see pungent).

Wiktionary
interpunction

n. The insertion of points between words or sentences; punctuation.

Usage examples of "interpunction".

As interpunction is never used in cipher of this kind, the dots could only be signs of abbreviation.