1. (作品、信件)收成全集的
An author's collected works or letters are all their works or letters published in one book or in a set of books.

2. (尤指在困难或危急情境中)镇定的，泰然自若的
If you say that someone is collected, you mean that they are very calm and self-controlled, especially when they are in a difficult or serious situation.

3. see also: collect

1. in full control of your faculties

e.g. the witness remained collected throughout the cross-examination
perfectly poised and sure of himself
more self-contained and more dependable than many of the early frontiersmen
strong and self-possessed in the face of trouble

Synonym: equanimouspoisedself-collectedself-containedself-possessed

2. brought together in one place

e.g. the collected works of Milton
the gathered folds of the skirt

Synonym: gathered