Definition of combinatorial in US English:

combinatorial

adjective

Mathematics
  • Relating to the selection of a given number of elements from a larger number without regard to their arrangement.

    ‘combinatorial analysis’

Pronunciation

combinatorial

/ˌkɑmb(ə)nəˈtɔriəl//ˌkämb(ə)nəˈtôrēəl/