mostly, mainly, for the most part
Alex es mayormente un pájaro corriente.
Alex is mostly an ordinary bird.
"Son mayormente especies nocturnas."
They’re mostly nocturnal species.
— Guardianes De La Noche (2004)
Pero mayormente quiere un ascenso y una medalla.
But mostly he wants a promotion and a medal.
— Los chicos del coro (2004)