The further information on this page may be of interest to advanced students and teachers.
The "father" of collocation is usually considered to be J.R. Firth, a British linguist who died in 1960. It was he that first used the term "collocation" in its linguistic sense.
An easy way to remember the meaning of collocation: think of "col-" or "co-" (together) and "location" (place) = place together, locate together, go together
Note also (non-linguistic senses):
Strong and weak collocation
If we look deeper into collocations, we find that not only do the words "go together" but there is a degree of predictability in their association. Generally, in any collocation, one word will "call up" another word in the mind of a native speaker. In other words, if I give you one word, you can predict the other word, with varying degrees of success. This predictability is not 100%, but it is always much higher than with non-collocates.
The predictability may be strong: for example "auspicious" collocates with very few words, as in:
Or the predictability may be weak: for example, "circuit" collocates with more than 20 words, as in:
Lexical and Grammatical Collocations
A distinction may, if wished, be made between lexical collocations and grammatical collocations.
A lexical collocation is a type of construction where a verb, noun, adjective or adverb forms a predictable connection with another word, as in:
A grammatical collocation is a type of construction where for example a verb or adjective must be followed by a particular preposition, or a noun must be followed by a particular form of the verb, as in:
When is a collocation NOT a collocation?
The term "collocation" in its linguistic sense is relatively new (dating from the 1950s) and not all linguists agree on its definition. In fact there is considerable disagreement and even some confusion. Some linguists treat fixed phrases as extended collocations (as far as I'm concerned, not on your life, rather you than me, under the weather, if you've got the time). Others suggest that when a sequence of words is 100% predictable, and allows absolutely no change except possibly in tense, it is not helpful to treat it as a collocation. Such sequences they generally treat as fixed expressions ("prim and proper") or idioms ("kick the bucket").
A good dictionary of collocations is the Oxford Collocations Dictionary for Students of English.