Every second one in a series, as in I'm supposed to take this pill every other day. How to use every other in a sentence. The word other, in this case, is used to mean alternate.It is similar to saying "every odd week" or "every even week", only it doesn't matter what number week it is, it only matters that it's every second one.. Saying "every week" and saying "every other week" are not equivalent; it has nothing to do with rules of grammar, only with the fact that it's every second week. Every other definition is - all those that are different or separate from the person or thing that has already been mentioned. Every other day/every second day etc definition: If something happens every other day or every second day , for example , it happens one... | Meaning, pronunciation, translations and examples They mean that you ‘miss’ one number. Every other day/week/month definition: If something happens , for example , every other day or every other month , there is a... | Meaning, pronunciation, translations and examples ‘Every other odd' and ‘every second odd' mean the same. [c. 1400]