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say it: AHR-buh-trer-ee
arbitrary is an adjective meaning "based on or subject to individual discretion or preference or sometimes impulse or caprice". It carries one recorded sense.
based on or subject to individual discretion or preference or sometimes impulse or caprice
“an arbitrary decision”
“the arbitrary rule of a dictator”
“an arbitrary penalty”
“of arbitrary size and shape”
“an arbitrary choice”
“arbitrary division of the group into halves”
Definitions, synonyms and semantic relations for arbitrary 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.