The ordinal number of forty-two in counting order(adjective)
WordNet. Princeton University. 2010.
Use "42nd" in a sentence
"The hallways and galleries of the main 42nd street branch are lined with display cases featuring artifacts from its vast collection of original and rare material."
"(She played Dorothy Brock in 42nd Street, twenty two years later.)"
"My great fondness for Jerry Orbach can be traced to the early eighties and his starring role as Julian Marsh in 42nd Street."