(physics, mathematics and biology) Forming nouns denoting subatomic particles (proton), quanta (photon), molecular units (codon), or substances (interferon).

(originally US, gambling) A gaming machine having a long arm-like handle at one side that a player pulls down to make reels spin; the player wins money or tokens when certain combinations of symbols line up on these reels.

Having only one arm; especially having lost an arm.

Having only one leg. / Of an audio signal: having a thin sound as a result of connection through only one wire of a circuit pair.

A plant, especially a tree.

(idiomatic) Considering only intrinsic good points and bad points, without prejudice or other considerations, such as procedural ones.

(idiomatic) In broad agreement or sharing a common general understanding or knowledge (common in office environments). / Used other than figuratively or idiomatically: on the same page.

(idiomatic, chiefly UK) not on your life, an emphatic form of no.

imposing or constituting a physical, mental, or figurative load which can be borne only with effort; burdensome.

plural of one / (sports) A senior or first team (as opposed to a reserves team). / (UK, prison slang) The cells located on the ground floor.