subject (in a monarchy) / subject / subject (topic, theme) / cause, reason / exam paper (on which the questions or tasks of an examination are written)

subject

(linguistics, grammar) syntactical subject (as opposed to semantic subject)

(linguistics, grammar) semantic subject (the true agent of an action, as opposed to the mere syntactical subject of a verb)

off-topic

(grammar, especially Old French) subjective case, subject case

(music) countersubject

about that, on this point, on this subject

questionable, doubtful, unconfirmed

about