(UK) Abbreviation or diminutive for baronet, later replaced by Bt. It is a post-nominative title; the pre-nominative is Sir (e.g. Sir John Smith Bart.).

(property law) Synonym of headlease.

(rare) superlative form of frequent: most frequent

(uncountable) Excessive or superior power. / (countable) A sovereign state with dominant status on the globe and a very advanced military, especially the United States or formerly the Soviet Union.