Etymology

Noun

1. A placing or being placed in nearness or contiguity, or side by side, often done in order to compare/contrast the two, to show similarities or differences.

   Parts that are united by a mere juxtaposition. — Glanvill.

   Juxtaposition is a very unsafe criterion of continuity. — Hare.

2. An absence of linking elements in a group of words that are listed together.

   Example: mother father instead of mother and father

3. Two or more contrasting sounds, registers, styles etc. placed together for stylistic effect.
4. A logical fallacy on the part of the observer, where two items placed next to each other imply a correlation, when none is actually claimed.
5. An absence of multiplication symbols.

   Example: ab instead of a × b

   • 2007, Lawrence Moss and Hans-Jörg Tiede, Applications of Modal Logic in Linguistics, in: P. Blackburn et al. (eds), Handbook of Modal Logic, Elsevier, p. 1054

     A fundamental operation on strings is string concatenation which we will denote by juxtaposition.