-Rational (definition)-
A number that can be expressed as the ratio of two integers.
-Rational (example)-
1.5 is a rational number.
-Irrational (definition)-
A number that cannot be expressed as the ratio of two integers.
-Irrational (example)-
π is a irrational number.
-Nonzero (definition)-
It is any number that is not equal to zero.
-Nonzero (example)-
1 is a nonzero number.