An essential or indispensable element, condition, or ingredient.

(chemistry) Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.

(transitive, intransitive) To incline the head up and down, as to indicate agreement. / (transitive, intransitive) To briefly incline the head downwards as a cursory greeting.

An instance of inclining the head up and down, as to indicate agreement, or as a cursory greeting. / A reference or allusion to something. / A nomination. / (figuratively) Approval.

An aristocrat; one of aristocratic blood. / (historical) A medieval gold coin of England in the 14th and 15th centuries, usually valued at 6s 8d.

Having honorable qualities; having moral eminence and freedom from anything petty, mean or dubious in conduct and character. / Grand; stately; magnificent; splendid.

(idiomatic, colloquial, US) No longer in quiet and comfortable surroundings

Not posing a threat.

(cricket) The state of a player who did not bat in an innings played by his side. Abbreviated DNB.

guided by practical experience and observation rather than by theory / (idiomatic) hardheaded, stubborn / (of a person) tough and relentlessly practical and thus not given to sentiment.