Final answer:
The word 'brilliant' means 'dazzling' in this context.
Step-by-step explanation:
The word 'brilliant' in the given context means 'dazzling.' In the sentence, it describes the color of the ball as being a bright and vivid blue, standing out in strong contrast to the dull, tan walls of the racquetball courts. It suggests that the color of the ball is striking and eye-catching.
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