'Jnr' definitions:

Definition of 'Jnr'

From: WordNet
noun
A son who has the same first name as his father [syn: Junior, Jr, Jnr]

Definition of 'Jnr'

From: GCIDE
  • Jnr \Jnr.\ n. Abbreviation for Junior, used after a name by a son who has the same first and last name as his father; -- less commonly used than Jr.
  • Syn: Junior, Jr. [WordNet 1.5]