WordWeight : Weighing the Words

Pronunciation : Least
Part of Speech : a.
Etymology : [OE. last, lest, AS. l, l, superl. of l less. See Less, a.] [Used as the superlative of little.]
Definition : Defn: Smallest, either in size or degree; shortest; lowest; most unimportant; as, the least insect; the least mercy; the least space.

Note: Least is often used with the, as if a noun. I am the least of the apostles. 1 Cor. xv. 9. At least, or At the least, at the least estimate, consideration, chance, etc.; hence, at any rate; at all events; even. See However. He who tempts, though in vain, at least asperses The tempted with dishonor. Milton. Upon the mast they saw a young man, at least if he were a man, who sat as on horseback. Sir P. Sidney. -- In least, or In the least, in the least degree, manner, etc. "He that is unjust in the least is unjust also in much." Luke xvi. 10. -- Least squares (Math.), a method of deducing from a number of carefully made yet slightly discordant observations of a phenomenon the most probable values of the unknown quantities.

Note: It takes as its fundamental principle that the most probable values are those which make the sum of the squares of the residual errors of the observation a minimum.
Source : Webster's Unabridged Dictionary, 1913

Pronunciation : Least
Part of Speech : adv.
Definition : Defn: In the smallest or lowest degree; in a degree below all others; as, to reward those who least deserve it.
Source : Webster's Unabridged Dictionary, 1913

Pronunciation : Least
Part of Speech : conj.
Definition : Defn: See Lest, conj. [Obs.] Spenser.
Source : Webster's Unabridged Dictionary, 1913