ETYMOLOGY
from Latin gravis (grave, weighty, important) + loqui, loquent- (to speak)
EXAMPLE
“… I treasure her unsentimental, enterprising, and no-nonsense-responsible spirit, her gravitas and graviloquence. I’d like to be capable (at least at times) of such classical conservatism, a necessary leaven for my mushy murky utopian pink political daydreaming …”
From: The Theater of Maria Irene Fornes, 1999
Lexicophilia 