The act of one who errs; sin.

present participle of er

Variant form of -er used in words ending with an abbreviation or (sometimes) a number.

One whose self-identity is in passive roles, such as experiencing and observing.

plural of erring

(sports, automotive) Acronym of energy recovery system: an electric generation, storage, and propulsion system used in Formula One, which generates electricity by scavenging excess power and energy, stores energy in batteries, and boosts acceleration with electric motors assisting the gasoline engine.

(informal, originally school slang) Used to form slang or colloquial equivalents of words. / (informal, originally school slang) Used to form mostly adjectives used informally.

plural of be-er

plural of ER

(heraldry) Abbreviation of ermine.