Etymology
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obligation (n.)

c. 1300, obligacioun, "a binding pledge, commitment to fulfill a promise or meet conditions of a bargain," from Old French obligacion "obligation, duty, responsibility" (early 13c.) and directly from Latin obligationem (nominative obligatio) "an engaging or pledging," literally "a binding" (but rarely used in this sense), noun of action from past-participle stem of obligare "to bind, bind up, bandage," figuratively "put under obligation" (see oblige). The notion is of binding with promises or by law or duty.

The meaning "that which one is bound or obliged to do, especially by moral or legal claims a duty" is from c. 1600. That of "state or fact of being bound or constrained by gratitude to requite benefits, moral indebtedness," also is from c. 1600. Related: Obligational.

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obligate (v.)

1540s, "to bind, fasten, connect," the literal sense of the Latin word, now obsolete in English; 1660s in the main modern sense of "to put under moral obligation;" a back-formation from obligation, or else from Latin obligatus, past participle of obligare "to bind, bind up, bandage," figuratively "put under obligation" (see oblige). Oblige, with which it has been confused since late 17c., means "to do one a favor." Related: Obligated; obligating.

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de rigueur 

1849, French, literally "of strictness," thus "according to obligation of convention." See rigor.

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endearment (n.)

"act of endearing," 1610s, from endear + -ment. Meaning "obligation of gratitude" is from 1620s; that of "action expressive of love" is from 1702.

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defaulter (n.)

"one who fails to perform some duty or obligation," 1650s, agent noun from default (v.).

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obligatory (adj.)

"binding in law or conscience, imposing duty, requiring performance of or forbearance from some act," c. 1400, obligatorie, from Old French obligatoire "creating an obligation, obligatory," and directly from Late Latin obligatorius "binding," from obligat-, past-participle stem of obligare "to bind, bind up, bandage," figuratively "put under obligation" (see oblige).

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delinquency (n.)

"failure or omission of duty or obligation," 1630s, from Late Latin delinquentia "fault, crime, delinquency," from Latin delinquentem (see delinquent).

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guarantor (n.)

"one who binds himself that the obligation of another shall be performed," 1811, from guarantee with Latinate agent noun suffix -or substituted for -ee.

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disoblige (v.)

c. 1600, "to free from obligation;" 1630s, "to refuse or neglect to oblige," from French désobliger (c. 1300), from des- (see dis-) + obliger, from Latin obligare "to bind, bind up, bandage," figuratively "put under obligation," from ob "to" (see ob-) + ligare "to bind," from PIE root *leig- "to tie, bind."

Colloquial sense of "put to inconvenience" is from 1650s (implied in disobligingness). Related: Disobliged; disobliging; disobligingly.

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duly (adv.)

"rightly, properly; adequately, sufficiently; in accordance with duty or moral obligation," late 14c., duweliche, from dewe "due" (see due) + -liche (see -ly (2)).

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