Big or large. for the adjectives, direct objects and stuff you need the plural eendings that match though.
The Latin adjective magnus-magna-magnum means "great" or "big."
Novio Magnum
Magnus, Magna, Magnum
Magnum(magnus=big)
"Magnum caelum."
Magnum Opus.
Cave canem magnum.
Magnus, Magna, Magnum
Gloria Estefan - Conga
This is not how to ask a question. There are two words in this phrase, not one. Magnum Opus is Latin, for Great Fruit, referring to the fruits of labour, so-called, of research or other concentrated effort in the Arts
Opus isthe nominative form of a Latin masculine noun of the 3rd declension which means "work"Magnum is the nominative case of the neutral form of the adjective magnus, magna, magnum (masc. fem. neuter ) which means "great"So Terra's magnum opus, is Terra's great work. But it would likely be: Terri magnum opus, because in Latin the genitive case (which usually ends with an "i" in the name shows personal possession.) So you end up with: The great work of Terra.
The term Magnum opus is from the Latin meaning "great work", refers to the largest, and perhaps the best, greatest, most popular, or most renowned achievement of an artist.