The number zero. Used in counting, mathematics, scores, and temperatures. In everyday contexts, ゼロ is also very common.
The temperature dropped to zero degrees.
His score was zero.
The stock went down to zero.
The possibility is close to zero.
He started his business from zero.
zero element
zero degrees (Celsius); freezing point · zero (on a scale)
shutout loss; losing without scoring; whitewash · undefeated; having no losses
twelve o'clock; midnight; noon
fragmentary remains of a large set of writings; odd volume; a few pages
a tiny bit; a very small amount
downfall; ruin; falling into straitened circumstances
dripping dew