noun

A punctuation mark (‘) used to indicate either possession (e.g. Harry’s book; boys’ coats) or the omission of letters or numbers (e.g. can’t; he’s; 1 Jan. ’99).

The playwrights’ experimental use of English (including the absence of capital letters, apostrophes, punctuation, etc.) is one way in which they resist oppression.

leaving out,exclusion,exception,non-inclusion,deletion,erasure,cut,excision,elimination,absence