Apposition

[Sarah]

The state of two nouns or pronouns, put in the same case,without a connecting word between them; as, I admire Cicero, theorator. Here, the second noun explains or characterizes the first.Growth by apposition (Physiol.), a mode of growth characteristic ofnon vascular tissues, in which nutritive matter from the blood istransformed on the surface of an organ into solid unorganizedsubstance.

[Luis Fok]

in grammar, a situation in which two nouns or noun phrases are used to refer to the same person or thing:

[Merna]

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