old documents / (in palaeography) historical documents written to convey a specific intention between a sender and receiver; generally inclusive of written material through the mid-19th century

paleography

to note; to write down

need, necessity / essential

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

a female given name

(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

(archaic) antique, old-fashioned / (colloquial) ancient