A conjunction of two or more things is the occurrence of them at the same time or place.

In grammar, a conjunction is a word or group of words that joins together words, groups, or clauses. In English, there are co-ordinating conjunctions such as 'and' and 'but', and subordinating conjunctions such as 'although', 'because', and 'when'.

If one thing is done or used in conjunction with another, the two things are done or used together.