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say it: roh-TAY-shuhn
rotation is a noun meaning "the act of rotating as if on an axis". It carries 4 recorded senses.
the act of rotating as if on an axis
“the rotation of the dancer kept time with the music”
(mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin
mathematics
a single complete turn (axial or orbital)
“the plane made three rotations before it crashed”
“the revolution of the earth about the sun takes one year”
a planned recurrent sequence (of crops or personnel etc.)
“crop rotation makes a balanced demand on the fertility of the soil”
“the manager had only four starting pitchers in his rotation”
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 rotation 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.