hinge vs trunnion

hinge

noun
  • A jointed or flexible device that allows the pivoting of a door etc. 

  • A principle, or a point in time, on which subsequent reasonings or events depend. 

  • One of the four cardinal points, east, west, north, or south. 

  • A stamp hinge, a folded and gummed paper rectangle for affixing postage stamps in an album. 

  • The median of the upper or lower half of a batch, sample, or probability distribution. 

  • A movement that presents itself as rotation when an off-centre fixed point is taken into account. 

  • A naturally occurring joint resembling such hardware in form or action, as in the shell of a bivalve. 

verb
  • To depend on something. 

  • The breaking off of the distal end of a knapped stone flake whose presumed course across the face of the stone core was truncated prematurely, leaving not a feathered distal end but instead the scar of a nearly perpendicular break. 

  • To attach by, or equip with a hinge. 

  • To move or already be positioned in such a fashion that it presents itself as rotation when an off-centre fixed point is taken into account. 

trunnion

noun
  • A similar rotational bearing comprising a rotating arc or ring sliding in the groove of a stationary arc, used in machinery to allow a workpiece to be moved relative to a fixed tool. 

  • A similar rotational bearing used in automotive suspensions. 

  • A shaft, held by a bearing, at each end or side of a rotatable object. 

  • One of the short stubby bearings on either side of a cannon; a gudgeon. 

How often have the words hinge and trunnion occurred in a corpus of books? (source: Google Ngram Viewer )