Open to the influence of.
Easily understood or appreciated.
Capable of being used or seen.
Easy to get along with.
Obtainable; to be got at.
Built or designed as to be usable by people with disabilities.
Easy of access or approach.
That operates to produce an effect.
Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
An operative person or thing.