Everyday vs Every Day: which is correct?

Adjective versus time phrase

Everyday, written as one word, is an adjective. It means ordinary, routine, commonplace, or suitable for normal days. It always describes a noun: everyday clothes, an everyday occurrence, everyday life, everyday language, our everyday routine. Because it is an adjective, it sits right before the noun it modifies, just like cheap or blue would. If you can put another adjective in the same slot, ordinary clothes, ordinary life, you are dealing with the one-word everyday.

Every day, written as two words, is a phrase meaning each day. Here every is a determiner modifying the noun day, and the phrase functions as an adverb of time, telling you how often something happens. I go for a run every day, she calls her mother every day, the shop opens every day. It answers the question how often, and it does not describe a noun the way an adjective does; it modifies the action or the whole sentence.

The substitution test

The single best test is to try replacing the word with each day. If each day fits naturally and keeps the meaning, you want the two-word every day, because every day literally means each day. I water the plants every day becomes I water the plants each day, which works, so two words are correct. They sell fresh bread every day becomes each day, which works, so two words.

If each day does not fit, you almost certainly want the one-word everyday adjective. These are everyday problems cannot become these are each day problems, so it must be the one-word everyday meaning ordinary. The test works because the two forms mean genuinely different things: each day is about frequency, while everyday is about being unremarkable. Whenever you can swap in each day, separate the words.

Examples that show the contrast

Everyday (one word, ordinary): everyday wear, an everyday task, everyday objects, everyday English, the everyday business of running a home, nothing out of the everyday. In each, the word describes a noun and means routine or commonplace; you could substitute ordinary.

Every day (two words, each day): I read every day, prices change every day, he is improving every day, we meet every day at noon, take one tablet every day. In each, the phrase tells you how often and could be replaced by each day.

The two can appear in one sentence, which makes the difference vivid: wearing everyday clothes every day is comfortable. The first is the adjective ordinary describing clothes (one word); the second is the time phrase each day telling you the frequency (two words). Reading that sentence and seeing why each form is what it is will fix the distinction better than any rule.

A reliable editing habit

On a proofreading pass, treat every everyday and every day as a flag and run the each-day test. If each day fits, split it into two words. If it does not, and the word is describing a noun, keep it as one word. Because the test is instant and unambiguous, a single careful pass catches every instance, and this is a slip that clusters in fast writing where the space gets dropped or added by accident.

A useful secondary check: ask whether the word is sitting right before a noun and describing it (one word, adjective) or modifying when something happens (two words, time phrase). An adjective immediately in front of a noun, like in everyday life, is the one-word form; a phrase telling you how often, like happens every day, is two words. Spell-check rarely flags this because both forms are valid, so the each-day test has to be yours. Run the quiz above, which mixes frequency sentences and ordinary-meaning sentences, until the right spacing is automatic.