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/ˈsiːzi.əm/ · noun
The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal..
Use caesium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Caesium means The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal..
Common synonyms include cesium, atomic number 55, cs.
The opposite depends on the specific sense.
Use caesium where its definition matches the intended context.
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