revenge tragedy
A type of play, popular in Elizabethan and Jacobean England, in which a wronged character seeks vengeance, usually featuring a ghost, madness (real or feigned), plotting and a bloody ending.
quarto / folio
Early printed book formats. Hamlet exists in two quartos (1603 and 1604/05) and the First Folio (1623), which differ in many lines.
soliloquy
A speech in which a character, alone on stage, speaks thoughts aloud.
aside
A short remark spoken to the audience (or to oneself) that other characters on stage do not hear.
antic disposition
Hamlet's phrase for the strange, mad-seeming behaviour he plans to put on (antic = grotesque, clownish).
semantic change
A change in a word's meaning over time (e.g. protest once meant vow).
pun
A play on words with more than one meaning or similar sounds.