Adjective
Subject to irregular changes in quantity or quality.
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More examples (2)
...they sat down beside the hearth in the adjoining room, over which the embers of the wood-fire cast a fluctuating light; now the long shadows falling duskily around—now dispersing them with bursts of brilliant flame, as the lighter wood kindled into a short-lived blaze.
From these remarks it will be seen that I look at the term species, as one arbitrarily given for the sake of convenience to a set of individuals closely resembling each other, and that it does not essentially differ from the term variety, which is given to less distinct and more fluctuating forms.
Noun
A fluctuation.
Adjective
having unpredictable ups and downs
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fluctuating prices