The crossword solution for the term 'One Part of a Whole' is UNIT. A UNIT is a single thing, object, or part of something larger. It is a basic measure used to quantify and compare different amounts. Units are used in many different fields, such as mathematics, science, engineering, and economics. In mathematics, units are used to measure length, area, volume, and other quantities. In science, units are used to measure energy, mass, temperature, and other physical properties. In engineering, units are used to measure force, pressure, and other mechanical properties. In economics, units are used to measure money, goods, and services.