Meaning

noun (physics) opposition to magnetic flux (analogous to electric resistance)

noun a certain degree of unwillingness

originEtymology tree English reluct Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -iader. Old French -ancebor. Middle English -aunce English -ance English reluctance From reluct + -ance. From Latin relū̆ctor (“to struggle against, oppose, resist”) + -ance, from re- (“back”) + luctor (“to struggle”).

Etymology from Wiktionary, CC BY-SA 3.0