and concurrently; in addition to; cum
Used to indicate that one person or thing serves two roles or functions simultaneously. Common in titles, job descriptions, and formal contexts.
彼は社長兼CEOです。
He is the president and CEO.
This room serves as both a study and a bedroom.
この部屋は書斎兼客間として使われている。
This room is used as a study-cum-guest room.
彼は教師兼作家だ。
He is both a teacher and a writer.
と is a plain listing particle that joins two separate items, whereas 兼 indicates that a single entity performs both functions simultaneously, as in 会議室兼倉庫 (meeting room cum storage room).
兼ねる is a verb meaning "to combine (roles)" and can stand alone as a predicate, while 兼 is the fixed conjunction placed between two nouns, as in 社長兼CEO.
combined use; multi-purpose; serving two purposes
concurrent post; additional role; serving also as
doing as a side business; running simultaneously · side business; second job
concurrent post; serving concurrently; holding an additional position · additional post; concurrent position
combine with; serve as both; hold an additional post; use with
combine both; have both qualities
uniting; unity; merging
studying two subjects together; double majoring; major-minor combination
additional post; concurrent post
From the kanji 兼, which originally means 'concurrently' or 'to combine'. The conjunction usage is a direct extension of this meaning.
operating simultaneously; running concurrently; concurrent operation
concurrent study of multiple schools or sects
concurrent post; holding multiple official posts
combined use; dual-purpose; serving two functions · holding two posts; concurrent positions
serving concurrently as; holding an additional post
serving concurrently as; holding the additional post of
having both; possessing both