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proliferation

/pɹəˌlɪf.əˈɹeɪ.ʃən/ noun C2
  1. The process by which an organism produces others of its kind; breeding, propagation, procreation, reproduction. (uncountable)
  2. The act of increasing, rising, or proliferating; augmentation, amplification, enlargement, escalation, aggrandizement. (countable)
  3. In particular, the spread (proliferating) of biochemical, nuclear and other weapons of mass destruction to countries not originally involved in developing them. (uncountable)
  4. The result of building up; buildup, accretion. (countable)

Plural proliferations

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From the library

Furthermore, the recent proliferation of digital tipping screens at countless checkout counters has intensified feelings of fatigue among everyday shoppers.
The Tipping Question, p. 1 · C1
The sudden proliferation of these remarkable performances demonstrated a fascinating phenomenon regarding human potential and collective sports psychology.
Shattering the Impossible: The Four-Minute Mile, p. 1 · C1
Advances in printing and the proliferation of distinct national literatures further solidified these separate orthographic standards over time.
Shaping American English, p. 1 · C1
Traditionalists and language purists frequently argue that the proliferation of this colloquial variety poses a significant threat to standard English proficiency.
The Linguistic Melting Pot: Understanding Singlish, p. 1 · 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.