US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈtræŋkwəˌlaɪz/ ,USA pronunciation: respelling(trangkwə līz′)

Inflections of 'tranquilize' (v): (⇒ conjugate)
v 3rd person singular (US & UK)
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing." (US & UK)
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed." (US & UK)
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked." (US & UK)

WordReference Random House Learner's Dictionary of American English © 2020
tran•quil•ize or  tran•quil•lize /ˈtræŋkwəˌlaɪz/USA pronunciation   v. [+ object], -ized or -lized, -iz•ing or -liz•ing. 
  1. to make tranquil, as by giving a drug to:The veterinarian tranquilized the dog with an injection.

WordReference Random House Unabridged Dictionary of American English © 2020
tran•quil•ize  (trangkwə līz′),USA pronunciation v.t., v.i.,  -ized, -iz•ing. 
  1. to make or become tranquil.
Also, tranquil•lize′;
[esp. Brit.,] tranquil•lise′. tran′quil•i•za tion, n. 
  • tranquil + -ize 1615–25

Collins Concise English Dictionary © HarperCollins Publishers::
tranquillize, tranquillise, US tranquilize /ˈtræŋkwɪˌlaɪz/ vb
  1. to make or become calm or calmer

ˌtranquilliˈzation, ˌtranquilliˈsation, US ˌtranquiliˈzation n
'tranquilize' also found in these entries (note: many are not synonyms or translations):
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