The term "mass" has different meanings depending on the context in which it is used. Here are a few common definitions:
Physics: Mass is a fundamental physical property of matter, and it is a measure of how much matter an object contains. In other words, it is a measure of the inertia of an object, or how much resistance it has to changes in motion. Mass is measured in units such as kilograms, pounds, or grams.
Chemistry: In chemistry, mass can refer to the total amount of matter in a substance, including both its atoms and its subatomic particles. This is often measured in units such as grams or moles.
Statistics: In statistics, mass can refer to the total number of observations in a dataset. For example, if you have a dataset of 100 people's heights, the mass of that dataset would be 100.
Religion: In some religious contexts, "mass" refers to a religious service, particularly in the Catholic Church, where it is a central part of the liturgy.
Medicine: "Mass" can also refer to an abnormal growth or lump of tissue, such as a tumor.
