definition of
pinion

[1] #1 pinion n. a gear with a small number of teeth designed to mesh with a larger wheel or rack. wn

[2] #2 pinion v. [shackle] bind the arms of. wn

[3] #3 pinion n. [flight feather, quill, quill feather] any of the larger wing or tail feathers of a bird. wn

[4] #4 pinion v. cut the wings off (of birds). wn

[5] #5 pinion n. [pennon] wing of a bird. wn