to summon officially or authoritatively to appear in court.
to quote; to repeat, as a passage from a book, or the words of another.
to list the source(s) from which one took information, words or literary or verbal context.
a citation
To employ by paying a retainer.
To hold back (a pupil) instead of allowing them to advance to the next class or year.
To keep in one's pay or service.
To keep in possession or use.
To hold secure.