Definition of complementizer in English:

complementizer

(also complementiser)

noun

Grammar
  • A word or morpheme that marks an embedded clause as functioning as a complement, typically a subordinating conjunction or infinitival to.

    • ‘The subordinator that introduces a complement clause is sometimes known as a complementizer: for example that in the sentence just cited.’
    • ‘Why do I think these apparently extra complementizers are a mistake, rather than a non-standard grammatical pattern?’
    • ‘Note that I had to check all the instances of that by hand, to distinguish the demonstratives from the complementizers.’
    • ‘In many logophoric languages, a complementizer of this kind does seem to play an important role in logophoric marking.’
    • ‘The option between complementizer that and no complementizer, for another: I think we should go.’

Pronunciation:

complementizer

/ˈkɒmplɪməntʌɪzə/