alternate
noun
someone who takes the place of another person
verb
go back and forth; swing back and forth between two states or conditions
Synonymsjumpexchange people temporarily to fulfill certain jobs and functions
be an understudy or alternate for a role
Synonymsunderstudyreverse (a direction, attitude, or course of action)
do something in turns
“We take turns on the night shift”
Synonymstake turns
adjective
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”
Synonymsalternatingof 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”
Oppositesopposite
Source: WordNet 3.1, Princeton University
