priceless treasure

convenient, useful, handy, helpful

prizing

priceless treasure

a dictionary (publication that explains the meanings of an ordered list of words)

a letter of resignation / a formal document of abdication when one emperor steps down and a new emperor ascends the throne

(obsolete) a letter of resignation

(chiefly women's speech) first person singular pronoun: I, me

(polite) first-person singular pronoun: I, me

a personal or private matter / (by extension) selfishness