(mathematics) An operation of an algebraic structure playing a role analogous to multiplication.

Of or pertaining to work that is done from home, especially via the Internet.

(uncountable) A yellow-brown, addictive narcotic drug obtained from the dried juice of unripe pods of the opium poppy, Papaver somniferum, and containing alkaloids such as morphine, codeine, and papaverine.

(music) A theatrical work, combining drama, music, song and sometimes dance. / (music) The score for such a work. / A building designed for the performance of such works; an opera house.

plural of opus; a collection of work.

(mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.

(intransitive, transitive) To have or express an opinion; to state as an opinion; to suppose, consider (that). / (intransitive) To give one's formal opinion (on or upon something).

(biochemistry) Any of a class of organic compounds, derived from amino acids, found in some plant tumours

The collaborative design of things, especially of open source software, through use of publicly shared design information.

Neither reflecting nor emitting light. / Allowing little light to pass through, not translucent or transparent. / (figuratively) Unclear, unintelligible, hard to get or explain the meaning of.