Self-evident, intuitively obvious.
Presumed without analysis.
Based on hypothesis and theory rather than experiment or empirical evidence.
Developed entirely from scratch, without deriving it from existing languages.
In a way based on theoretical deduction rather than empirical observation.
Perceptible; able to be perceived.
Able to be treated as fact; real or concrete.
Comprehensible by the mind; understandable.
Touchable; able to be touched or felt; perceptible by the sense of touch.
A physical object; something that can be touched.
Real or concrete results.