For elastic, isotropic and homogeneous materials, zero Poisson's ratio means that the material doesn't present lateral deformation on bending, compressing or extending.
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Yes. If each of a and b is a number and b is not zero, the ratio of a to b, often written as a:b, = a/b.
If they are both zero, the the fraction is undefined. Otherwise it means that the ratio is equal to one.
Ratio
A number that can be expressed as a ratio of two integers, X/Y where Y is not zero.
Provided the second integer is not a zero, the ratio will be a rational number.