Meanings

zero-sum game

zero divisor

waste-water container (tea ceremony)

bulbil (esp. of a Japanese yam)

spilling

unexpected piece of good luck

midnight

A6M Zero fighter

non-zero

zero element

fragmentary remains of a large set of writings

zero-point vibration

alpine bistort (Bistorta vivipara)

null set

noon

confirmation that a ballot box contains no ballots before voting commences (performed by the first voter at each polling station)

point-blank shot

very close range