Noun is from Latin mandatum (“a charge, order, command, commission, injunction”), neut of. mandatus, past participle of mandare (“to commit to one's charge, order, command, commission, literally to put into one's hands”), from manus (“hand”) + dare (“to put”). Compare command, commend, demand, remand.
Verb is from the noun.
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mandate (plural mandates)
- An official or authoritative command; an order or injunction; a commission; a judicial precept.
- to authorize
Derived terms 
- mandate in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- mandate in The Century Dictionary, The Century Co., New York, 1911
- first-person singular present indicative of mandater
- third-person singular present indicative of mandater
- first-person singular present subjunctive of mandater
- second-person singular imperative of mandater
- Plural form of mandata
- second-person plural present tense of mandare
- second-person plural imperative of mandare
- feminine plural past participle of mandare
- vocative masculine singular of mandātus