a combining form with the meaning “high,” used in the formation of compound words: altigram, altitude.
Also alto-; especially before a vowel, alt-.

Origin of alti-

Middle English < Latin alti- combining form of altus high Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for alti-


combining form

indicating height or altitudealtimeter

Word Origin for alti-

from Latin altus high
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