(idiomatic) in first place in a contest

(transitive, idiomatic) to mislead, to try to make someone believe a lie. / (transitive, idiomatic) to encourage with the illusion of a romantic relationship.

(slang) A state of erection of one's penis. / Used other than figuratively or idiomatically: see lead, pencil.

(less common) Synonym of first fiddle

(historical) Printed type which is set with extra leading in such a way as to give the text greater emphasis. / (historical) Printed type in general, as opposed to engravings or handwritten documents.

(chemistry) A toxic organometallic compound, (C₂H₅)₄Pb, added to petroleum/gasoline as an antiknock agent.

(linear algebra) A main diagonal.

(pathology) A chronic intoxication produced by the absorption of lead into the body, characterized by severe colicky pains, a dark line along the gums, and local muscular paralysis.

unrefined lead, cast in blocks called pigs

Alternative form of lead-out