Large in amount or number; more than enough. It is often used for things like notes, food, or details.
From Latin *copiosus* 'plentiful, rich', from *copia* 'abundance, plenty'. It has kept the sense of overflowing quantity for centuries.
Copious is a stylish way to say 'a lot'—'copious notes' sounds more academic than 'tons of notes.' The Latin root *copia* also gives us 'cornucopia,' the horn of plenty. The word often carries a hint of 'almost too much,' especially with things like tears or details.
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