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sincerely (adv.)

1530s, "correctly;" 1550s, "honestly," from sincere + -ly (2). As a subscription to letters, recorded from 1702.

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Definitions of sincerely from WordNet

sincerely (adv.)
with sincerity; without pretense;
she praised him sincerely for his victory
Synonyms: unfeignedly / truly
sincerely (adv.)
written formula for ending a letter;
Synonyms: sincerely yours
From wordnet.princeton.edu