Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the fundamental force

plural: fundamental forces

A fundamental force is one of the four forces of which all other forces (outside of elementary particles) are forms. The fundamental forces are (in order of decreasing strength):

1. the strong nuclear force, which keeps protons and neutrons together in the nucleus of an atom and plays a role in almost all nuclear reactions.
2. the weak nuclear force, which plays a role in spontaneous radioactivity.
3. the electromagnetic force, which keeps electrons and nuclei together in atoms, and plays a role in all chemical reactions and in electrical and magnetical forces.
4. gravity, which tries to keep mass together.