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Nouns ending with a consonant preceding the o are made plural by adding either an s or an es—although zero can be spelled either way: zeros or zeroes.
Note that an e is added to the verb zero to form the present tense (zeroes) or past tense (zeroed), but an e is not needed to form the present participle (zeroing).
The verb zero in has a casual tone and is not recommended in formal writing; consider using synonyms such as "focus on" and "concentrate on" instead.
For clarity, hyphenate zero when it is used in a compound modifier, as in zero-tolerance policy.
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