Copious means present in large quantity. Copious notes, copious amounts, copious tears.
It belongs to things that flow or accumulate rather than to countable objects, so copious notes and copious rain are natural and copious chairs is not. The Latin means abundance, and copy comes from the same word.
1adjectivecopiousPresent in large quantity.
“She took copious notes during the lecture, filling ten pages.”
copious is a quantity.
Latin copiosus comes from copia, abundance; copy is a relative.
Proto-Indo-European
*h₃ep-
Latin
copiosus
Middle English
copious
English, today
copious
Built from
From Middle English copious, from Latin copiosus, from copia (“abundance”), equivalent to co- + ops (“wealth”) + -osus (“full of”). by surface analysis, copy + -ous.
Etymology from Wiktionary, CC BY-SA