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indent (v.1)

early 15c., indenten, endenten "to make notches; to give (something) a toothed or jagged appearance," also "to make a legal indenture, make a written formal agreement or contract," from Old French endenter "to notch or dent, give a serrated edge to" (12c.) and directly from Medieval Latin indentare "to furnish with teeth," from in- "into, in, on, upon" (from PIE root *en "in") + verb from Latin dens (genitive dentis) "tooth" (from PIE root *dent- "tooth").

An indented document was usually, if not always, written in two or more identical versions. Orig. these were written on a single sheet of parchment and then cut apart along a zigzag, or 'indented' line. Each party to the agreement retained one copy, which he could readily authenticate by matching its serrate edge with that of another copy. [Middle English Compendium]

The printing sense "insert white space to force text inward" is first attested 1670s. Related: Indented (late 14c.); indenting.

indent (v.2)

"to dent or press in," c. 1400, from in (adv.) + dent (v.). Etymologically distinct from indent (v.1) but felt as the same.

indent (n.)

"cut or notch in a margin," 1590s, from indent (v.1). A supposed earlier noun sense of "a written agreement" (late 15c.) is described in Middle English Compendium as "scribal abbrev. of endenture."

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Definitions of indent from WordNet
1
indent (v.)
set in from the margin;
indent (v.)
cut or tear along an irregular line so that the parts can later be matched for authentication;
indent the documents
indent (v.)
notch the edge of or make jagged;
indent (v.)
bind by or as if by indentures, as of an apprentice or servant;
Synonyms: indenture
indent (v.)
make a depression into;
Synonyms: dent
2
indent (n.)
an order for goods to be exported or imported;
indent (n.)
the space left between the margin and the start of an indented line;
From wordnet.princeton.edu