off Broadway
noun
often capitalized O
: a part of the New York professional theater stressing fundamental and artistic values and formerly engaging in experimentation
off-Broadway
ˈȯf-ˈbrȯd-ˌwā 
adjective or adverb often capitalized O 
Word History
Etymology
from its usually being produced in smaller theaters outside of the Broadway theatrical district
First Known Use
1953, in the meaning defined above