The word 'concinnity'

Hi

Could you please use the word ‘concinnity’ in a sentence for me? I looked up its meaning in several dictionaries but could not understand its use.

Thanks,

Tom

“He has what one character calls ‘the gifts of concinnity and concision,’ that deft swipe with a phrase that can be so devastating in children” (Elizabeth Ward).

His accent is in concinnity with his style.

What I meant to say is, style and accent are two different parts, but somehow share the same element so they are in concinnity.

Does the sentence make sense? Can somebody comfirm that I’ve understood the word concinnity correctly?

Many thanks,
Cantik