say it: AWL-tur-nuht
alternate is a verb, adjective and noun meaning "go back and forth; swing back and forth between two states or conditions". It carries 10 recorded senses.
reverse (a direction, attitude, or course of action)
every second one of a series
“the cleaning lady comes on alternate Wednesdays”
“jam every other day”
serving or used in place of another
“an alternative plan”
occurring by turns; first one and then the other
“alternating feelings of love and hate”
of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired
“stems with alternate leaves”
botany
someone who takes the place of another person
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for alternate come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.