Definition of complementariness in US English:

complementariness

noun

  • See complementary

    • ‘For example, the first effect of complementariness would have to be isolated between memory and intelligence.’
    • ‘I have, since then, thought a little bit about complementariness - and I think there's a bit of a paradox here.’
    • ‘Jernegan sees both a complementariness and an antagonism in this interaction, as well as a degree of synthesis.’
    • ‘That innate complementariness is an absolute necessity in painting, just as free meter in poetry or polyphony in music.’
    • ‘It is in those intervals that the communion happens, and then you will see the complementariness of the opposites.’