Definition of predicate nominative in English:

predicate nominative

noun

Grammar
  • A word in the nominative case that completes a copulative verb, such as son in the sentence Charlie is my son.

    • ‘Later, if you want your child to know what a predicate nominative is, there will be plenty of time for that training.’
    • ‘No one cares if your children know what a predicate nominative is except the publishers of grammar workbooks.’
    • ‘But I did notice one pattern after a little more searching: ‘the boss of’ tends to occur in predicate nominatives - that is, in noun phrases after some form of be, as in ‘You're not the boss of me’.’