physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass

A COHERENT, TYPICALLY LARGE BODY OF MATTER WITH NO DEFINITE SHAPE

THE QUANTITY OF THREE-DIMENSIONAL SPACE OCCUPIED BY A LIQUID, SOLID, OR GAS.

atoms as a source of nuclear energy. the atom "the power of the atom"

2. EACH OF MORE THAN ONE HUNDRED SUBSTANCES THAT CANNOT BE CHEMICALLY INTERCONVERTED OR BROKEN DOWN INTO SIMPLER SUBSTANCES AND ARE PRIMARY CONSTITUENTS OF MATTER. EACH ELEMENT IS DISTINGUISHED BY ITS ATOMIC NUMBER, I.E., THE NUMBER OF PROTONS IN THE NUCLEI OF ITS ATOMS. WEATHER, CLIMATE, METEOROLOGICAL CONDITIONS, ATMOSPHERIC CONDITIONS; MORE (IN CHURCH USE) THE BREAD AND WINE OF THE EUCHARIST.

THING THAT IS COMPOSED OF TWO OR MORE SEPARATE ELEMENTS; A MIXTURE