1. The association between two words that are typically or frequently used together: Such words as "strong coffee" and "heavy drinker" are typical English collocations; as well as, "bosom buddy" and "dead serious".
2. An arrangement in which things are placed next to each other or close together: The artist made a collocation of certain pieces which formed a sculpture.

Clare saw the organized collocations of books on the shelves in the library.