zero

1 zero /ˈziroʊ/ noun
plural zeros also zeroes
1 zero
/ˈziroʊ/
noun
plural zeros also zeroes
Britannica Dictionary definition of ZERO
1 
: the number 0
[count]
[noncount]
2 
[noncount] : the temperature shown by the zero mark on a thermometer
— see also absolute zero, subzero
3 
[noncount] : nothing at all
4 
[count] informal : a person who is not important, interesting, popular, etc. — usually singular
2 zero /ˈziroʊ/ adjective
2 zero
/ˈziroʊ/
adjective
Britannica Dictionary definition of ZERO
: not any
3 zero /ˈziroʊ/ verb
zeroes; zeroed; zeroing
3 zero
/ˈziroʊ/
verb
zeroes; zeroed; zeroing
Britannica Dictionary definition of ZERO
[+ object] technical
: to set (a measuring device, such as a scale) so that it reads 0

zero in on

[phrasal verb]
1 
zero in on (someone or something)
: to direct all of your attention to (someone or something)
2 
: to aim something (such as a gun or camera) directly at (someone or something)

zero out

[phrasal verb]
zero (something) out or zero out (something) US
: to reduce the amount of (something) to zero
: to remove (something) completely