BP adjective 1adverb 1noun 6 adjective1 •Initialism of bipolar. adverb1 •Initialism of Before Present, conventionally relative to radiocarbon dating in the 1950s.Later diversion of lake drainage between 11,000 and 10,000 BP, due to ice retreat, led to the discharge of Agassiz meltwaters into the western North Atlantic. — 2013 noun6 •Initialism of blood pressure.I was concerned to find the BP even higher when I took it. — 2002 •Initialism of base pair. •Initialism of boiling point. •Initialism of business plan. •Abbreviation of benzoyl peroxide. •Initialism of backpropagation.