http://www.nyu.edu/oaa/faculty.html#titles

Nontenure Positions [bylaw 73]

a) Instruction or research service shall be without tenure implications of any kind, regardless of rank or title, if rendered in a part-time capacity, or in a temporary position, or in a program having a subsidy of limited duration. Appointment to a nontenure position shall be for a definite period of time, not exceeding one academic year unless otherwise specified, and shall automatically terminate at the close of that period unless there is an official notice of renewal. Nontenure positions include the following:

• instructor;

• research professor, research associate professor, research assistant professor (except when the title of research professor is conferred as a distinction upon a person already having tenure at New York University);

• adjunct professor, adjunct associate professor, adjunct assistant professor;

• clinical professor, clinical associate professor, clinical assistant professor;

• visiting professor, visiting associate professor, visiting assistant professor;

• senior research scientist, research scientist, associate research scientist, assistant research scientist;

• senior language lecturer and language lecturer;

• lecturer, master teacher, teacher, master artist, artist-in-residence;

• teaching fellow, teaching associate, teaching assistant;

• associate, research associate, assistant, clinical assistant, graduate assistant, research assistant.

Any position designated by a title not specified in this chapter shall be a nontenure position unless the Board of Trustees determines otherwise.