n. The act or quality of endorsingn. An amendment or added notation to an insurance contract or other official document (such as a driving licence).n. An instructor's signed acknowledgement of time practising specific flying skills.n. Permission to carry out a specific skill or application in a field in which the practitioner already has a general licence.n. Sponsorship, in means of money, by a company, business or enterprise.n. Support from an important, renowned figure of a media (celebrity, politics, sports, etc.), to get back up.