say it: PI-nyuhn
pinion is a noun and verb meaning "a gear with a small number of teeth designed to mesh with a larger wheel or rack". It carries 5 recorded senses.
a gear with a small number of teeth designed to mesh with a larger wheel or rack
any of the larger wing or tail feathers of a bird
cut the wings off (of birds)
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 pinion 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.