#1 alternate v. [jump] go back and forth; swing back and forth between two states or conditions. wn
#2 alternate s. every second one of a series; "the cleaning lady comes on alternate Wednesdays"; "jam every other day"- the White Queen. wn
#3 alternate s. [alternating] occurring by turns; first one and then the other; "alternating feelings of love and hate". wn
#4 alternate n. [surrogate, replacement] someone who takes the place of another person. wn
#5 alternate v. exchange people temporarily to fulfill certain jobs and functions. wn
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