Definition of "IRT"

IRT

proper noun
1. Initialism of Interborough Rapid Transit Company.
prepositional phrase
1. Initialism of in reference to.
noun
countable and uncountable, plural IRTs
1. The subway lines, collectively, formerly run by the Interborough Rapid Transit Company.
  Quotations
  A Soho sweetheart wants the man who injured her husband thrown in front of the IRT.
  1977 April 30, Steve Blevins, “A Sack-full of Films”, in Gay Community News, page 11
2. Initialism of item response theory.
3. Initialism of investigation and recovery team.