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Pronunciation varies by accent · adjective
(physics, of an elementary particle, or the equivalent electromagnetic radiation) Having an energy greater than 100,000 electron volts..
Use high-energy when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
High-energy means (physics, of an elementary particle, or the equivalent electromagnetic radiation) Having an energy greater than 100,000 electron volts..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use high-energy where its definition matches the intended context.
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