Oxford Advanced American Dictionary

Definition of lord noun from the Oxford Advanced Learner's Dictionary

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lord

noun
lord pronunciation English lɔːd lord pronunciation American lɔːrd
 
1 [countable] (in Britain) a man of high rank in the nobility (= people of high social class), or somebody who has been given the title lord as an honour compare lady2 Lord (in Britain) the title used by a lordLord Beaverbrook3 Lord a title used for some high official positions in Britainthe Lord Chancellorthe Lord MayorLord Justice Slade4 My Lord (in Britain) a title of respect used when speaking to a judge, bishop or some male members of the nobility (= people of high social class) compare lady5 a powerful man in medieval Europe, who owned a lot of land and propertya feudal lordthe lord of the manor see also overlord, warlord6 (usually the Lord) [singular] a title used to refer to God or ChristLove the Lord with all your heart.7 Our Lord [singular] a title used to refer to Christ8 the Lords [singular + singular or plural verb] = House of LordsThe Lords has/have not yet reached a decision. compare Commons see also law lord
Idioms

(good) Lord!

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oh Lord!

exclamation used to show that you are surprised, annoyed or worried about somethingGood Lord, what have you done to your hair!

Lord knows…

used to emphasize what you are saying
Lord knows, I tried to teach her.

Lord (only) knows (what, where, why, etc.)…

(informal) used to say that you do not know the answer to something‘Why did she say that?’ ‘Lord knows!’
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Some people may find the use of Lord in these expressions offensive.
Idioms
see
drunk as a lord at drunk adjective
, year of our Lord at year