novelty

Short definition from Wiktionary

Noun

1. 1
   The state of being new or novel; newness.
2. 2
   A new product; an innovation.
3. 3
   A small mass-produced trinket.
4. 4
   In novelty theory, newness, density of complexification, and dynamic change as opposed to static habituation.
5. 5
   An opening move played for the first time ever (in high-level chess).

Adjective

1. 1
   In the design of a common household item, often impractically large, and meant primarily for display rather than functional use.

Proper noun

1. 1
   A village in Missouri.