Also means
brightness
Usage Note
Brillantez denotes outstanding intellectual or artistic brilliance — la brillantez de su actuación (the brilliance of his performance). It is distinct from brillo (physical shine or gloss) and from brillante (adjective: brilliant). The -z ending shifts to -c- before pluralizing: brillanteces, though the word is rarely used in the plural.
Examples
"La brillantez de su discurso dejó al público sin palabras."
Natural Translation
The brilliance of his speech left the audience speechless.

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