key, important point / essential piece of something, requirement

the pin or rivet holding the spines of a folding fan together / (by extension) a pivot, cornerstone, keystone / a pin, often decorated, holding the handle to the tang of a katana

(archaic, possibly obsolete) the pin or rivet holding the spines of a folding fan together

(archaic, possibly obsolete) fortress, redoubt / (archaic, possibly obsolete) important point, key

need, necessity / essential

a female given name

gingham

(computing) a worm

custom, custom-made / customs (duties or government agency)

(literary) spring dream / (literary, figuratively) short-lived occurrence; brief moment of joy; transient joy