'Must' definitions:

Definition of 'must'

From: WordNet
adjective
Highly recommended; "a book that is must reading"
noun
A necessary or essential thing; "seat belts are an absolute must"
noun
Grape juice before or during fermentation
noun
The quality of smelling or tasting old or stale or mouldy [syn: mustiness, must, moldiness]

Definition of 'Must'

From: GCIDE
  • Must \Must\, n. [AS. must, fr. L. mustum (sc. vinum), from mustus young, new, fresh. Cf. Mustard.]
  • 1. The expressed juice of the grape, or other fruit, before fermentation. "These men ben full of must." --Wyclif (Acts ii. 13.). [1913 Webster]
  • No fermenting must fills . . . the deep vats. --Longfellow. [1913 Webster]
  • 2. [Cf. Musty.] Mustiness. [1913 Webster]

Definition of 'Must'

From: GCIDE
  • Must \Must\ (m[u^]st), v. i. or auxiliary. [OE. moste, a pret. generally meaning, could, was free to, pres. mot, moot, AS. m[=o]ste, pret. m[=o]t, pres.; akin to D. moetan to be obliged, OS. m[=o]tan to be free, to be obliged, OHG. muozan, G. m["u]ssen to be obliged, Sw. m[*a]ste must, Goth. gam[=o]tan to have place, have room, to able; of unknown origin.]
  • 1. To be obliged; to be necessitated; -- expressing either physical or moral necessity; as, a man must eat for nourishment; we must submit to the laws. [1913 Webster]
  • 2. To be morally required; to be necessary or essential to a certain quality, character, end, or result; as, he must reconsider the matter; he must have been insane. [1913 Webster]
  • Likewise must the deacons be grave. --1 Tim. iii. 8. [1913 Webster]
  • Morover, he [a bishop] must have a good report of them which are without. --1 Tim. iii. 7. [1913 Webster]
  • Note: The principal verb, if easily supplied by the mind, was formerly often omitted when must was used; as, I must away. "I must to Coventry." --Shak. [1913 Webster]

Definition of 'Must'

From: GCIDE
  • Must \Must\, v. t. & i. To make musty; to become musty. [1913 Webster] must

Definition of 'must'

From: GCIDE
  • must \must\, musth \musth\(m[u^]st), a. [Hind. mast intoxicated, ruttish, fr. Skr. matta, p.p. of mad to rejoice, intoxicate.] (Zool.) Being in a condition of dangerous frenzy, usually connected with sexual excitement; -- said of adult male elephants which become so at irregular intervals, typicaly due to increased testosterone levels. -- n. (a) The condition of frenzy. (b) An elephant in must. [Webster 1913 Suppl. +PJC]

Synonyms of 'must'

From: Moby Thesaurus