pluralize
Concise Oxford English Dictionary © 2008 Oxford University Press:
pluralize /ˈplʊərəlʌɪz/ (or pluralise)
▶verb
- 1 cause to become more numerous.
■ cause to be made up of several different elements.
- 2 give a plural form to (a word).
– derivatives
pluralization noun.
pluralization noun.
'pluralize' also found in these Oxford entries:

