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reluctance (n.)

1640s, "act of struggling against," from obsolete verb reluct "to struggle or rebel against" (1520s), from Latin reluctari "to struggle against, resist, make opposition," from re- "against, in opposition" (see re-) + luctari "to struggle, wrestle," from Proto-Italic *lukto-, from PIE *lug-to- "bent" (source also of Old Irish foloing "supports," inloing "connects;" Middle Welsh ellwng- "to set free;" Greek lygos "withy, pliant twig," lygizein "to bend, twist;" Gothic galukan "to shut," uslukan "to open;" Old English locc "twist of hair." Meaning "unwillingness" is attested from 1660s. Related: Reluctancy (1620s.).

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Definitions of reluctance from WordNet

reluctance (n.)
(physics) opposition to magnetic flux (analogous to electric resistance);
reluctance (n.)
a certain degree of unwillingness;
a reluctance to commit himself
From wordnet.princeton.edu