Etymology
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chlorinate (v.)

"to combine or treat with chlorine," 1836 (implied in chlorinated), from chlorine (n.) + -ate (2). Related: Chlorinating.

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massage (v.)

"apply massage to, treat by means of massage," 1874, from massage (n.). Figurative sense of "manipulate" (data, etc.) is by 1966. Related: Massaged; massaging.

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psychoanalyze (v.)

also psycho-analyze, psychoanalyse, "subject to or treat by psychoanalysis," 1911; see psycho- + analyze. Related: Psychoanalyzed; psychoanalyzing. Earlier was psychologize (1830).

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invitatory (adj.)

"using or containing invitation," 1640s, from Latin invitatorius "inviting," from invitat-, past-participle stem of invitare "to invite, treat, entertain" (see invitation).

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estrange (v.)

late 15c., from French estrangier "to alienate," from Vulgar Latin *extraneare "to treat as a stranger," from Latin extraneus "foreign, from without" (see strange). Related: Estranged.

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sedate (v.)
"treat with sedatives," 1945, a back-formation from the noun derivative of sedative (adj.). The word also existed 17c. in a sense "make calm or quiet." Related: Sedated; sedating.
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neglect (v.)

1520s, "omit to do or perform;" 1530s, "treat carelessly or heedlessly, treat with disrespect or without proper attention or care;" from Latin neglectus, past participle of neglegere "to make light of, disregard, be indifferent to, not heed, not trouble oneself about," literally "not to pick up," variant of neclegere, from Old Latin nec "not" (from PIE root *ne- "not") + legere "pick up, select," from PIE root *leg- (1) "to collect, gather." Related: Neglected; neglecting.

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slight (v.)
c. 1300, "make plain or smooth," from slight (adj.) Meaning "treat with indifference" (1590s) is from the adjective in sense of "having little worth." Related: Slighted; slighting.
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pet (v.)
1620s, "treat as a pet," from pet (n.1). Sense of "to stroke" is first found 1818. Slang sense of "kiss and caress" is from 1920 (implied in petting). Related: Petted.
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disregard (v.)

"treat as unworthy of regard or notice," 1640s, from dis- + regard. Related: Disregarded; disregarding. As a noun, "failure to regard or notice," from 1660s. Related: Disregardful.

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