The Latin word opus translated into English mean deed or labor.
Op is sort for opus. A convenient method of numbering a composer's works where a number follows the word 'opus'. For example, Opus 28, No. 4.
Work is liberty.
A musical work.
Magnum Opus.
TI means "Rapper from Atlanta"
Opera is the plural form of opus, operis and it mean works or fortifications
question is, Keat's opus.... answer is Keat's opus is a POEM
Opus number is given for a specific work to recognize it from others. Two compositions from the same composer will never have the same opus number. As an example, the opus number of Emperor Concerto (by Beethoven) is Op. 73.
I think you mean Ralph Waldo Emerson and his opus title probably refers to "essay" as he is famous for his essays. This is the answer in common crossword puzzles.
The usual expression is simply "Opus est" (It / that is needed), as pronouns such as "id" (it) are usually omitted in Latin, because they are redundant with the tense of the verb.
"Op" stands for "Opus". The number following indicates the order in which his/her compositions were written. Opus 66 would then be the 66th work that composer wrote.