(US, taxation) Initialism of Employer Identification Number.

(Polari) London

plural of EIN

(chemistry) Used in a compound distinguished from a compound with a name ending in -in or -ine.

(chemistry) Alternative form of -ein.

A transuranic chemical element (symbol Es) with atomic number 99: a soft, silvery, paramagnetic metal.

(physics) A gaseous superfluid phase of matter in which all the particles have the same quantum state.

(Norse mythology) The warriors who died fighting bravely and were brought by valkyries to Valhalla, where they feast and prepare for Ragnarok.

Albert Einstein, the world-famous 20th-century theoretical physicist who developed the theory of relativity. / A surname from German.

(sometimes sarcastic) An extremely clever or intelligent person.