A grammatical construction in which two elements, usually noun phrases, are placed side by side, with one element serving to define or modify the other.

In the sentence 'My friend, the doctor, will see you now,' the phrase 'the doctor' is in apposition to 'my friend'.

The positioning of things or the condition of being side by side or close together.

The apposition of the two paintings allowed viewers to compare their styles easily.

The process of growth or increase by the addition of successive layers on a surface, especially in biological tissues and geological formations.

Bones widen through apposition, with new tissue added to the outer surface.