n. The condition or quality of being necessary or needful; the mode of being or of truth of that which is necessary; the impossibility of the contrary; the absolute character of a determination or limitation which is not merely without exception, but which would be so in any possible state of things; absolute constraint.n. As applied to the human will, the opposite of liberty.n. In philosophy, the inevitable determination of the human will by a motive or other cause. This is only a special use of the word in the free-will dispute. In philosophy generally, by the necessity of a cognition is properly meant a cognized necessity, or universality in reference to possible states of things; although some writers use the word to denote a constraint upon the power of thought.n. A condition requisite for the attainment of any purpose; also, a necessary of life, without which life, or at least the life appropriate to one's station, would be impossible.n. Want of the means of living; lack of the means to live as becomes one's station or is one's habit.n. Extreme need, in general.n. Business; something needful to be done.n. Bad illicit spirit.n. Synonyms Necessity, Need. Necessity is more urgent than need: a merchant may have need of more money in order to the most successful managing of his business; he may have a necessity for more cash in hand to avoid going into bankruptcy.