These verbs mean to express a favorable opinion or to signify satisfaction or acceptance. Approve means to consider right or good, but it can also denote official consent: “The colonel or commanding officer approves the sentence of a regimental court-martial” (Charles James). Endorse implies the public expression of support: The senator endorsed the candidate by issuing a press release.Sanction usually implies official authorization: The privilege of voting is a right sanctioned by law.Certify and accredit imply official approval based on compliance with requirements or standards: “The proper officers, comparing every article with its voucher, certified them to be right” (Benjamin Franklin). The board of education will accredit only institutions that have a sufficiently rigorous curriculum. To ratify is to invest officially with legal authority: “Amendments . . . shall be valid . . . when ratified by the Legislatures of three fourths of the several States” (U.S. Constitution, Article V).
Note: This word, when it signifies to be pleased with, to think favorably (of), is often followed by of.
From Middle English aproven, appreven (“to prove”), Old French aprover (“to approve”), (French approuver), from Latinapprobō, from ad + probō (“to esteem as good, approve, prove”). Compare prove, approbate.
(third-person singular simple present approves, present participle approving, simple past and past participle approved)
(English Law) To make profit of; to convert to one's own profit;—said especially of waste or common land appropriated by the lord of the manor.
Old French aprouer; a- + a form apparently derived from the pro, prod, in Latinprōsum (“be useful or profitable”). Compare with improve.
English Wiktionary. Available under CC-BY-SA license.