obligate [ verb ob-li-geyt; adjective ob-li-git, -geyt] Word Origin See more synonyms on Thesaurus.com verb (used with object), ob·li·gat·ed, ob·li·gat·ing. to bind or oblige morally or legally: to obligate oneself to purchase a building. to pledge, commit, or bind (funds, property, etc.) to meet an obligation. morally or legally bound; obliged; constrained. necessary; essential. . Biology restricted to a particular condition of life, as certain organisms that can survive only in the absence of oxygen: obligate anaerobe (opposed to facultative). Origin of obligate 1400–50; late Middle English obligat
(past participle of
to bind), equivalent to
ligate Related forms ob·li·ga·ble , [ ob-li-g uh-b uh l] /ˈɒb lɪ gə bəl/ adjective ob·li·ga·tor, noun non·ob·li·gat·ed, adjective pre·ob·li·gate, verb (used with object), pre·ob·li·gat·ed, pre·ob·li·gat·ing. qua·si-ob·li·gat·ed, adjective re·ob·li·gate, verb (used with object), re·ob·li·gat·ed, re·ob·li·gat·ing. un·ob·li·gat·ed, adjective Can be confused obligate oblige
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for obligator to compel, constrain, or oblige morally or legally (in the US) to bind (property, funds, etc) as security compelled, bound, or restricted biology able to exist under only one set of environmental conditions an obligate parasite cannot live independently of its host Compare facultative (def. 4) Derived Forms obligable, adjective obligative, adjective obligator, noun Word Origin
C16: from Latin
obligāre to oblige
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for obligator obligate v.
1540s, "to bind, connect;" 1660s, "to put under moral obligation," back-formation from
obligation, or else from Latin obligatus, past participle of obligare (see oblige). Oblige, with which it has been confused since late 17c., means "to do one a favor." Related: Obligated; obligating.
Online Etymology Dictionary, © 2010 Douglas Harper
obligate (ŏb ′lĭ-gĭt, -gāt′) Able to exist or survive only in a particular environment or by assuming a particular role.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
obligate [ŏb ′lĭ-gĭt, -gāt′] Capable of existing only in a particular environment or by assuming a particular role. An obligate aerobe, such as certain bacteria, can live only in the presence of oxygen. An obligate parasite cannot survive independently of its host. Compare facultative.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.