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“attenuate” in Latin

The English word attenuate itself goes back to Latin tenuis, through attenuātus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

attenuate
attenuare: extenuare (to make thinner, litterally; then, figuratively, to lessen, with respect to time orstrength): diluere (to dilute; e.g., vinum, potionem).
attenuate
attenuatus: extenuatus (e.g., aer extenuatus).

Quick answer

What is the Latin word for attenuate?
The usual Latin words for “attenuate” are attenuō, extenuō, dīluō; also vīnum, pōtiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.