Etymology
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pat (n.)

c. 1400, "a blow, stroke," perhaps originally imitative of the sound. Meaning "light tap with hand" is from c. 1804. Sense of "that which is formed by patting" (as in pat of butter) is 1754, probably from the verb. Pat on the back in the figurative sense "gesture or expression of encouragement, sympathy, etc." is attested by 1804.

pat (adv.)

1570s, "aptly, suitably, at the right time," perhaps from pat (adj.) in sense of "that which hits the mark," a special use from pat (n.) in the sense of "a hitting" of the mark. The modern adjective meaning "that is exactly to the purpose, suitable for the occasion" is 1630s, from the adverb.

pat (v.)

1560s, "to hit, throw;" meaning "to tap or strike lightly" is from 1714; from pat (n.). Related: Patted; patting. The nursery rhyme phrase pat-a-cake is known from 1823. Alternative patty-cake (usually American English) is attested from 1794 (in "Mother Goose's Melody, or Sonnets for the Cradle," Worcester, Mass.).

Pat

as a fem. proper name, short for Patricia. As a masc. proper name, short for Patrick; hence a nickname for any Irishman.

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Definitions of pat
1
pat (v.)
pat or squeeze fondly or playfully, especially under the chin;
Synonyms: chuck
pat (v.)
hit lightly;
pat him on the shoulder
Synonyms: dab
2
pat (n.)
the sound made by a gentle blow;
Synonyms: rap / tap
pat (n.)
a light touch or stroke;
Synonyms: tap / dab
3
pat (adj.)
having only superficial plausibility;
Synonyms: glib / slick
pat (adj.)
exactly suited to the occasion;
a pat reply
4
pat (adv.)
completely or perfectly;
he has the lesson pat
had the system down pat
From wordnet.princeton.edu