Etymology
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inhibition (n.)
late 14c., "formal prohibition; interdiction of legal proceedings by authority;" also, the document setting forth such a prohibition, from Old French inibicion and directly from Latin inhibitionem (nominative inhibitio) "a restraining," from past participle stem of inhibere "to hold in, hold back, keep back," from in- "in, on" (from PIE root *en "in") + habere "to hold" (from PIE root *ghabh- "to give or receive"). Psychological sense of "involuntary check on an expression of an impulse" is from 1876.
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disinhibition (n.)

"reduction of or freedom from inhibition," 1927; see dis- + inhibition. From the start it was noted as being, often, "inhibition of an inhibition."

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inhibitory (adj.)
late 15c., from Medieval Latin inhibitorius "inhibitory," from inhibit-, past participle stem of Latin inhibere "to hold in, keep back" (see inhibition).
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inhibit (v.)
early 15c., "to forbid, prohibit," back-formation from inhibition or else from Latin inhibitus, past participle of inhibere "to hold in, hold back, keep back," from in- "in, on" (from PIE root *en "in") + habere "to hold" (from PIE root *ghabh- "to give or receive"). Psychological sense (1876) is from earlier, softened meaning of "restrain, check, hinder" (1530s). Related: Inhibited; inhibiting.
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*ghabh- 
also *ghebh-, Proto-Indo-European root meaning "to give or receive." The basic sense of the root probably is "to hold," which can be either in offering or in taking.

It forms all or part of: able; avoirdupois; binnacle; cohabit; cohabitation; debenture; debit; debt; dishabille; due; duty; endeavor; exhibit; exhibition; forgive; gavel; gift; give; habeas corpus; habiliment; habit; habitable; habitant; habitat; habitation; habitual; habituate; habituation; habitude; habitue; inhabit; inhibit; inhibition; malady; prebend; prohibit; prohibition; provender.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit gabhasti- "hand, forearm;" Latin habere "to have, hold, possess," habitus "condition, demeanor, appearance, dress;" Old Irish gaibim "I take, hold, I have," gabal "act of taking;" Lithuanian gabana "armful," gabenti "to remove;" Gothic gabei "riches;" Old English giefan, Old Norse gefa "to give."
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photoperiodism (n.)

"stimulation or inhibition to breeding, etc., based on daily periods of light and darkness," 1920, from photoperiod "period of daily illumination which an organism receives" (1920, from photo- + period) + -ism.

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