IPA: /nɒnˈdɪmɛnʃənl/
KK: /nɑnˈdɪmɛnʃənl/
Not having dimensions; often used in mathematics or physics to describe quantities that do not depend on physical dimensions.
In physics, a nondimensional number can simplify complex equations by removing units.
Nondimensional → It is formed from "non-" (meaning not) and "dimensional" (from Latin "dimensio", meaning measurement). The word "nondimensional" refers to something that does not have dimensions or measurements.
Think of 'non-' meaning not, and 'dimensional' relating to measurement — so nondimensional means something that is not measured or does not have dimensions.