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endorsement

/ɛnˈdɔːrsmənt/ · en·dor·sement
noun
  1. The act or quality of endorsing; giving approval or support. The celebrity's endorsement of the eco‑friendly brand boosted its sales dramatically.
  2. An amendment or annotation added to an insurance contract or other official document. He added a flood‑damage endorsement to his homeowner's insurance after the recent storms.
  3. An instructor's signed acknowledgement of a pilot's proficiency in a specific skill. Once she obtained the night‑flying endorsement, Joanna was cleared to take the pilot's examination.
Did you know? The word stems from a Latin phrase meaning ‘to write on the back’, referring to a signature on the reverse of a document, a practice that gave rise to its modern sense of official approval.
Written by Lexi Wordsworth, Dictionary Editor 1 lookups Added Jul 25, 2026