intimate (adj.)

1630s, "closely acquainted, very familiar," also "inmost, intrinsic," from Late Latin intimatus, past participle of intimare "make known, announce, impress," from Latin intimus "inmost, innermost, deepest" (adj.), also used figuratively, of affections, feelings, as a noun, "close friend;" superlative of in "in" (from PIE root *en "in"). Intimate (adj.) used euphemistically in reference to women's underwear from 1904. Related: Intimately.

intimate (v.)

1530s, "make known formally;" 1580s, "suggest indirectly," back-formation from intimation (which could explain the pronunciation) or else from Late Latin intimatus, past participle of intimare "to make known." The Old French verb was intimer. Related: Intimated; intimating.

intimate (n.)

1650s, "familiar friend, person with whom one is intimate," from intimate (adj.). Sometimes 17c.-19c. in false Spanish form intimado. Latin intimus had a similar noun sense. Intimates as a commercial euphemism for "women's underwear" is from 1988.

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Definitions of intimate from WordNet
intimate (adj.)
marked by close acquaintance, association, or familiarity; "intimate relations between economics, politics, and legal principles" - V.L. Parrington;
intimate friend
intimate (adj.)
concerning things deeply private and personal;
intimate correspondence
Synonyms: private
intimate (adj.)
having or fostering a warm or friendly and informal atmosphere;
the small room was cozy and intimate
an intimate cocktail lounge
Synonyms: cozy / informal
intimate (adj.)
having mutual interests or affections; of established friendship;
pretending she is on an intimate footing with those she slanders
Synonyms: familiar
intimate (adj.)
used euphemistically to refer to the genitals;
he touched her intimate parts
intimate (adj.)
involved in a sexual relationship;
the intimate (or sexual) relations between husband and wife
she had been intimate with many men
Synonyms: sexual
intimate (adj.)
innermost or essential;
the intimate structure of matter
Synonyms: inner / internal
intimate (adj.)
thoroughly acquainted through study or experience; "this girl, so intimate with nature"-W.H.Hudson; "knowledgeable about the technique of painting"- Herbert Read;
Synonyms: knowledgeable / versed
intimate (v.)
give to understand;
Synonyms: adumbrate / insinuate
intimate (v.)
imply as a possibility;
Synonyms: suggest
intimate (n.)
someone to whom private matters are confided;
Synonyms: confidant