UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌsʌbdɪˈvaɪd/

US:USA pronuncation: IPAUSA pronuncation: IPA/ˈsʌbdɪˌvaɪd/

US:USA pronunciation: respellingUSA pronunciation: respelling(sub′di vīd, subdi vīd′)

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

WordReference Random House Learner's Dictionary of American English © 2020
sub•di•vide /ˈsʌbdɪˌvaɪd/USA pronunciation   v.,  -vid•ed, -vid•ing. 
  1. (of something already divided) to (cause to) become divided into smaller parts: [no object]The recently formed egg cells subdivided.[+ object]to subdivide the cells.
  2. to divide (a piece of land) into building lots:[+ object]to subdivide the three-square-block area into smaller units for development.
sub•di•vi•sion /ˈsʌbdɪˌvɪʒən/USA pronunciation  n. [countable]a housing subdivision; a political subdivision.

WordReference Random House Unabridged Dictionary of American English © 2020
sub•di•vide  (sub′di vīd, subdi vīd′),USA pronunciation v.,  -vid•ed, -vid•ing. 
  1. to divide (that which has already been divided) into smaller parts;
    divide again after a first division.
  2. to divide into parts.
  3. to divide (a plot, tract of land, etc.) into building lots.

  1. to become separated into divisions.
sub′di•vida•ble, adj. 
subdi•vid′er, n. 
  • Late Latin subdīvīdere. See sub-, divide
  • late Middle English 1400–50

Collins Concise English Dictionary © HarperCollins Publishers::
subdivide /ˌsʌbdɪˈvaɪd; ˈsʌbdɪˌvaɪd/ vb
  1. to divide (something) resulting from an earlier division

ˌsubdiˈvider n
'subdivide' also found in these entries (note: many are not synonyms or translations):

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