Definition of secularize in US English:

secularize

(British secularise)

verb

[with object]
  • 1Convert from religious to secular possession or use.

    ‘the convent had been secularized in the nineteenth century’
    1. 1.1 Dissociate or separate from religious or spiritual concerns.
      ‘the government secularized the public school system’
      ‘an increasingly secularized society’

Pronunciation

secularize

/ˈsekyələˌrīz/