Etymology
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indulgence (n.)
mid-14c., in the Church sense, "a freeing from temporal punishment for sin, remission from punishment for sin that remains due after absolution," from Old French indulgence or directly from Latin indulgentia "complaisance, a yielding; fondness, tenderness, affection; remission," from indulgentem (nominative indulgens) "indulgent, kind, tender, fond," present participle of indulgere "be kind; yield, concede, be complaisant; give oneself up to, be addicted," a word of uncertain origin. It is evidently a compound, and the second element appears to be from PIE root *dlegh- "to engage oneself, be or become fixed." The first element could be in- "in" for a sense of "let someone be engaged" in something, or in- "not" for a total sense of "not be hard toward" someone.

Sense of "leniency, forbearance of restraint or control of another, gratification of desire or humor" is attested from late 14c. That of "yielding to one's inclinations" (technically self-indulgence) in English is from 1630s. In British history, Indulgence also refers to grants of certain liberties to Nonconformists under Charles II and James II, as special favors rather than legal rights. The sale of indulgences in the original Church sense was done at times merely to raise money and was widely considered corrupt; the one in 1517 helped to spark the Protestant revolt in Germany.
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self-indulgence (n.)

"habit of undue gratification of one's own passions, desires, etc.," 1650s; see self- + indulgence.

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overindulgence (n.)

also over-indulgence, "excessive indulgence," 1630s, from over- + indulgence. First attested in Donne (over-indulgency). Related: Overindulgent.

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indulgent (adj.)
"lenient, willing to overlook faults," often in a bad sense, "too lenient," c. 1500, from Latin indulgentem (nominative indulgens) "kind, tender, fond," present participle of indulgere "be kind, be complaisant, yield" (see indulgence). Related: Indulgently.
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indulge (v.)
formerly also endulge, 1630s, "to grant as a favor;" 1650s, "to treat with unearned favor" (in reference both to persons and desires), a back-formation from indulgence (q.v.), or directly from Latin indulgere "be complaisant, be indulgent, yield; give oneself up to." Related: Indulged; indulging; indulgingly.
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gambling (n.)
1784, "habitual indulgence in gambling," verbal noun from gamble (v.). Gambling-house attested by 1794.
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jaded (adj.)
"bored by continual indulgence," 1630s; past-participle adjective from jade (v.). Related: Jadedly; jadedness.
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sensualist (n.)

"one given to indulgence of appetites, one who finds happiness in carnal pleasures," 1660s, from sensual + -ist. Related: Sensualistic.

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petting (n.)

1873, "fondling, indulgence," verbal noun from pet (v.). Meaning "amorous caressing, foreplay" is from 1920 (in F. Scott Fitzgerald).

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bestiality (n.)
late 14c., "the nature of beasts," from bestial + -ity. Meaning "indulgence in bestial instincts" is from 1650s; sense of "sexual activity with a beast" is from 1611 (KJV).
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