Etymology
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steam (n.)

Old English steam "vapor, fume, water in a gaseous state," from Proto-Germanic *staumaz (source also of Dutch stoom "steam"), of unknown origin. Meaning "vapor of boiling water used to drive an engine" is from 1690s, hence steam age (1828) and many figurative uses, such as let off steam (1831, literal), blow off steam (1857, figurative), full-steam (1878), get up steam (1887, figurative). Steam heat is from 1820s in thermodynamics; as a method of temperature control from 1904.

We have given her six months to consider the matter, and in this steam age of the world, no woman ought to require a longer time to make up her mind. [Sarah Josepha Hale, "Sketches of American Character," 1828]

steam (v.)

Old English stiemen, stymen "emit vapor, emit a scent or odor," from the root of steam (n.). Meaning "go by steam power" is from 1831. Transitive sense from 1660s, "to emit as steam;" meaning "to treat with steam" is from 1798. Slang steam up (transitive) "make (someone) angry" is from 1922. Related: Steamed; steaming.

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Definitions of steam
1
steam (v.)
travel by means of steam power;
The ship steamed off into the Pacific
Synonyms: steamer
steam (v.)
emit steam;
The rain forest was literally steaming
steam (v.)
rise as vapor;
steam (v.)
get very angry;
her indifference to his amorous advances really steamed the young man
steam (v.)
clean by means of steaming;
steam-clean the upholstered sofa
Synonyms: steam clean
steam (v.)
cook something by letting steam pass over it;
just steam the vegetables
2
steam (n.)
water at boiling temperature diffused in the atmosphere;
From wordnet.princeton.edu