The definition of the word concept fro Princeton is "an abstract or general idea inferred or derived from specific instances".
In this sense, a concept only exists in the mind so it is not observable to anyone but yourself, nor is it tangible at all. However a concept in the visual sense such as a concept drawing is obviously observable.
because there wouldmt be aconcept to a game if there was no rules. there wouldn't be a winner or loser, there even wouldn't be a game to play
Behavior is observable.
We are at the centre of the observable universe, keyword being 'observable'.
The detective positioned himself in the shadows of some bushes, from where the suspect was observable.
observable ? i'd say quarks.
The observable traits are part of your DNA, your genetics.
An organism observable structure classifier.
Behaviorism focuses on observable behavior.
Any natural occurrence that is observable or creates an effect which is observable
what would be an observable change in sound when the frequency changes
how Goggle's idea of "Google ambassador" can be an element in their observable culture
Observable Traits