Etymology
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mantra (n.)

1808, "that part of the Vedas which contains hymns," from Sanskrit mantra-s "sacred message or text, charm, spell, counsel," literally "instrument of thought," related to manyate "thinks," from PIE root *men- (1) "to think." Meaning "sacred text used as a charm or incantation" is by 1900; sense of "special word used for yoga meditation" is recorded in English by 1956.

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*men- (1)

Proto-Indo-European root meaning "to think," with derivatives referring to qualities and states of mind or thought.

It forms all or part of: admonish; Ahura Mazda; ament; amentia; amnesia; amnesty; anamnesis; anamnestic; automatic; automaton; balletomane; comment; compos mentis; dement; demonstrate; Eumenides; idiomatic; maenad; -mancy; mandarin; mania; maniac; manic; mantic; mantis; mantra; memento; mens rea; mental; mention; mentor; mind; Minerva; minnesinger; mnemonic; Mnemosyne; money; monition; monitor; monster; monument; mosaic; Muse; museum; music; muster; premonition; reminiscence; reminiscent; summon.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit manas- "mind, spirit," matih "thought," munih "sage, seer;" Avestan manah- "mind, spirit;" Greek memona "I yearn," mania "madness," mantis "one who divines, prophet, seer;" Latin mens "mind, understanding, reason," memini "I remember," mentio "remembrance;" Lithuanian mintis "thought, idea," Old Church Slavonic mineti "to believe, think," Russian pamjat "memory;" Gothic gamunds, Old English gemynd "memory, remembrance; conscious mind, intellect."

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Hare Krishna (adj.)
1970, from the title of a Hindu chant or mantra, from Hindi hare "O God!" + Krishna, name of an incarnation of the god Vishnu.
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mandarin (n.)

1580s, "Chinese official," via Portuguese mandarim or older Dutch mandorijn from Malay (Austronesian) mantri, from Hindi mantri "councilor, minister of state," from Sanskrit mantri, nominative of mantrin- "adviser," from mantra "counsel," from PIE root *men- (1) "to think." Form influenced in Portuguese by mandar "to command, order."

Used generically for the several grades of Chinese officials; the Chinese equivalent is kwan "public servant." Sense of "chief dialect of Chinese" (spoken by officials and educated people and generally in the northern, central, and western provinces and Manchuria) is from c. 1600. Transferred sense of "important person" attested by 1907. The type of small, deep-colored orange so called from 1771, from resemblance of its color to that of robes worn by mandarins.

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