Everyday

"everyday" is an adjective which should only be used as such, e.g., "an everyday occurrence".

Your sentence isn't using it in that way though; you're referring to something that happens each day and so it should be spelled out as two separate words - "Every day over 50,000...".

I really hate this mistake.

"Everyday" is synonymous with "normal" or "routine." It is an adjective.

"Every day" means "daily."

Another one that gets my goat is "nevermind." It's a Nirvana album, not an appropriate response to a question!

Not separating "every day" is an everyday mistake among highschoolers.

Sly & The Family Stone had it right with "Everyday People"... adjective, like Jon & Sarah said.

Good one, people!
How about "everytime" Vs. "every time"?,
everyweek - every week ?
everymonth - every month ?
etc. etc.

I, too, witness and correct this mistake every day. It's such an everyday thing, I was starting to doubt my sanity!

Everyday is an adjective meaning "daily."

Every day is a time expression meaning "each day" or "regularly."

Note the difference in the following sentences:

1. Jane goes to class every day (each day)

2. Jane has an everyday class. (a daily class)

Actually, everyday (one word) does NOT mean "daily". It means "normal", "routine", "commonplace".

From American Heritage Dictionary:

1 - Appropriate for ordinary days or routine occasions: a suit for everyday wear.
2 - Commonplace; ordinary: everyday worries.

Oh, and every day (two words) does NOT mean "regularly". It means just what it says, "every" "day". Not every other day, not skipping a day here and there. Once a week is "regularly" but it certainly isn't every day.