old documents / (in palaeography) historical documents written to convey a specific intention between a sender and receiver; generally inclusive of written material through the mid-19th century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

rare, unusual

(rare) The katakana syllable ヸャ (vya).

to use / to employ / to make use of, to apply / to spend

(informal) word written in katakana, i.e. a loanword. In particular, it refers to foreign words that are not so popular in Japan and whose meaning is not well understood.

use one thing for many purposes / work someone hard

to use one's head