All 3 Uses

perjury
in
Romeo and Juliet
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Dost thou love me? I know thou wilt say "ay,"
And I will take thy word. Yet, if thou swear'st,
Thou mayst prove false. At lovers' perjuries,
They say Jove laughs.
p. 75.7 *

perjuries = lies

editor's notes: Jove is a synonym for Jupiter--the King of the Roman gods. "At lovers perjuries they say Jove laughs." references an at-the-time well-known line from Ovid, "Jupiter from on high smiles at the perjuries of lovers.". Ovid was a famous Roman poet.
All perjured,
All forsworn, all naught, all dissemblers.†
p. 135.7

perjured = broke the law by telling lies after formally promising to tell the truth
Thy dear love sworn, but hollow perjury,
p. 149.8

perjury = lie (something that is not true)

editor's notes: It might be easier to read this as "but a hollow perjury."

Definitions:

(1) (perjury)
the criminal offense of telling lies after formally promising to tell the truth -- such as when testifying in a court trial
(2) (meaning too rare to warrant focus)