Dictionary.com
definitions

lentamente

[len-tuh-men-tey; Italian len-tah-men-te]

adverb Music.

slowly.

Origin of lentamente

1755–65; < Italian, equivalent to lenta- (see lento) + -mente adv. suffix < Latin: ablative of mēns mind, purpose, intention (see mental1)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for lentamente

lentamente

adverb

music to be played slowly

Word Origin for lentamente

C18: Italian, from lento
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012