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Noun pinion has 3 senses
- pinion - a gear with a small number of teeth designed to mesh with a larger wheel or rack
--1 is a kind of gear, gear wheel, cogwheel
--1 has particulars: lantern pinion, lantern wheel
- flight feather, pinion, quill, quill feather - any of the larger wing or tail feathers of a bird
--2 is a kind of feather, plume, plumage
--2 is a part of wing
--2 has particulars: primary, primary feather, primary quill; tail feather
- pennon, pinion - wing of a bird
--3 is a kind of wing
--3 is a part of bird