Origin: Latin suffix -ous
Numerous has 2 different meanings across 1 category:
Indefinitely large numerically, many.
"Numerous stars twinkled above the dark horizon."
In plain English: Numerous means there are a lot of something, so many that it is hard to count them all.
"There were numerous people waiting in line for the concert."
Usage: Use numerous to describe a large but countable quantity of distinct items, such as numerous stars or numerous errors. Avoid using it for uncountable concepts like numerous water or numerous happiness.
Numerous comes from the Latin word numerosus, which originally meant "abundant" or "harmonious." The term entered Middle English directly from this Latin root, derived from the noun for number.