Zero

ziro

(informal: virtually none)

ziro

(meteorology: of a cloud ceiling: limiting vision to 50 feet (15 meters) or less)

ziro

(meteorology: of horizontal visibility: limited to 165 feet (50.3 meters) or less)

ziro

(linguistics: present at an abstract level but not realized in the data)

sifuri

(cardinal number before 1, denoting nothing)

ziro

(to set to zero)