Meaning

• (usually with the definite article) A place to do the "necessary" business of urination and defecation: an outhouse or lavatory.

Meaning

• Required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty.

  "Although I wished to think that all was false, it was yet necessary that I, who thus thought, must in some sense exist."

• Unavoidable, inevitable.

  "If it is absolutely necessary to use public computers, you should plan ahead and forward your e-mail to a temporary, disposable account."

• Determined, involuntary: acting from compulsion rather than free will.