Apposition

The act of adding; application; accretion.

The putting of things in juxtaposition, or side by side; also, the condition of being so placed.

The state of two nouns or pronouns, put in the same case, without a connecting word between them; as, I admire Cicero, the orator. Here, the second noun explains or characterizes the first.

(biology) growth in the thickness of a cell wall by the deposit of successive layers of material

the act of positioning close together (or side by side); "it is the result of the juxtaposition of contrasting colors"