Origin of attent
1275–1325; Middle English < Latin attentus attentive (past participle of attendere), equivalent to atten(d)- (see attend) + -tus past participle suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
late 15c., "attentive," from Latin attentus, past participle of attendere (see attend). As a noun, "intention, aim" (early 13c.), from Old French atente "act of attending," from fem. of Latin attentus.
Online Etymology Dictionary, © 2010 Douglas Harper