Etymology
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troth (n.)

"truth, verity," late 12c., from a phonetic variant of Old English treowð "faithfulness, veracity, truth;" see truth, which is a doublet of this word. Restricted to Midlands and Northern England dialect after 16c., and to certain archaic phrases (such as plight one's troth). Also see betroth.

updated on April 27, 2017

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Definitions of troth from WordNet

troth (n.)
a mutual promise to marry;
Synonyms: betrothal / engagement
troth (n.)
a solemn pledge of fidelity;
Synonyms: plight
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.