FluentPlex

mass

/mæs/ noun B2
  1. A quantity of matter cohering so as to make one body, or an aggregation of particles or things which collectively make one body or quantity, usually of considerable size. (countable, uncountable)
  2. A measure of the inertia of a mass of matter, one of four fundamental properties of matter. SI unit of mass: kilogram. (countable, uncountable)
  3. A medicinal substance made into a cohesive, homogeneous lump, of consistency suitable for making pills. (countable, uncountable) · blue mass
  4. A palpable or visible abnormal globular structure. (countable, uncountable) · Near-synonym: lump
  5. Excess body mass, especially in the form of muscle hypertrophy. (countable, uncountable)
  6. A large quantity; a sum. (countable, uncountable)
  7. Bulk; magnitude; body; size. (countable, uncountable)
  8. The principal part; the main body. (countable, uncountable)

Plural masses

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From the library

Kill.” A scuffling mass of monkeys, biting, scratching, tearing, and pulling, closed over Bagheera, while five or six laid hold of Mowgli, dragged him up the wall of the summerhouse and pushed him through the hole of the broken dome.
The Jungle Book, p. 53 · B2
And still from all the cross streets they were hurrying and rattling toward the converging point at full speed, and hurling themselves into the struggling mass, locking wheels and adding their drivers’ imprecations to the clamour.
Six stories from The Four Million, p. 13 · C1
It was a January the Premier came, to address his loyal supporters and such of his nonsupporters as chose to be present at the monster mass meeting held in Charlottetown.
Anne of Green Gables, p. 132 · C1
Rachel were enjoying themselves hugely at the mass meeting, Anne and Matthew had the cheerful kitchen at Green Gables all to themselves.
Anne of Green Gables, p. 132 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.