infidelity

[ in-fi-del-i-tee ]
/ ˌɪn fɪˈdɛl ɪ ti /

noun, plural in·fi·del·i·ties.

marital disloyalty; adultery.
unfaithfulness; disloyalty.
lack of religious faith, especially Christian faith.
a breach of trust or a disloyal act; transgression.

Origin of infidelity

1375–1425; late Middle English < Latin infidēlitās, equivalent to infidēli(s) unfaithful (see infidel) + -tās -ty2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for infidelity

British Dictionary definitions for infidelity

infidelity
/ (ˌɪnfɪˈdɛlɪtɪ) /

noun plural -ties

lack of faith or constancy, esp sexual faithfulness
lack of religious faith; disbelief
an act or instance of disloyalty
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012