(US Army, US Air Force and US Navy, derogatory, slang) Newly-commissioned graduate of three-month Officer Candidate School (Army, Air Force), Midshipman School (Navy), or Direct Commissioning program.

plural of 900

(Canada, geography) Suburban areas in the province of Ontario closely surrounding the city of Toronto.

Clipping of 1-900.

Alternative form of over nine thousand

Of telephone numbers dialed in North America, having an additional charge assessed to the caller, part of which is returned to the owner of the number.

plural of 900 number

(Canada, US) A telephone number for which an extra charge is assessed, part of which is returned to the owner of the number.

(oncology) The vitamin biotin labelled with radioactive (yttrium-90), used in the treatment of cancer, where it seeks out tumor cells that have been targeted by an antibody linked to streptavidin and kills them.

(sports) The act of spinning 900 degrees in the air, doing two and a half complete turns.