ethics, especially that branch dealing with duty, moral obligation, and right action.
Origin: 1820–30; < Greekdeont- that which is binding (stem of déon, neuter present participle of deîn to bind), equivalent to de- bind + -ont- present participle suffix + -o- + -logy
philosophy (of an ethical theory) regarding obligation as deriving from reason or as residing primarily in certain specific rules of conduct rather than in the maximization of some good
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
1826, from Gk. deont-, comb. form of deon "that which is binding, duty," neut. prp. of dei "is binding;" + -logia "discourse" (see -logy). Related: Deontological (1832).