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alternate
This word carries a rhythmic quality of oscillation. It describes a pendulum-like movement where two distinct states or entities swap positions in a predictable sequence. It is frequently used in technical, mathematical, or scheduling contexts to denote a precise pattern of repetition.
Countable when referring to a specific substitute person, such as a backup player on a sports team. Uncountable when referring to the general concept of alternation in a sequence.
Meanings
To occur in turn first one and then the other.
"The lights alternate between red and green."
To switch repeatedly between two states or options.
"The weather alternates between rain and sunshine."
Available as another possibility or choice.
"The team sought an alternate route to avoid the traffic."