| fundamental interaction | |
| —n | |
| any of the four basic interactions that occur in nature: the gravitational, electromagnetic, strong, and weak interactions | |
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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a chattering or flighty, light-headed person. |
| fundamental interaction | |
noun | |
| (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons [syn: interaction] |