What's the difference between spelling everyday been one word or every day two words?

Answer 1

From http://wsu.edu/~brians/errors/everyday.html:
“Everyday” is a perfectly good adjective, as in “I’m most comfortable in my everyday clothes.” The problem comes when people turn the adverbial phrase “every day” into a single word. It is incorrect to write “I take a shower everyday.” It should be “I take a shower every day.”

See also:
http://www.bartelby.com/68/13/2313.html
Spelled as one word, everyday is Standard as an adjective: These are my everyday clothes. The adjective-noun combination every day, as in Every day is a new opportunity, can also serve as an adverb, as in I have lunch with them every day. Spelling the adverb as one word is Nonstandard.

http://www.celebrityenglish.com/commonly-confused-everyday/

Answer 2

Every day

adjective
1. occurring or done each day; "a daily record"; "day-by-day labors of thousands of men and women"- H.S.Truman; "her day-after-day behavior"; "an every day occurrence" [syn: daily]

adverb
1. without missing a day; "he stops by daily" [syn: daily]

Everyday -

adjective
1. of or pertaining to every day; daily: an everyday occurrence.
2. of or for ordinary days, as contrasted with Sundays, holidays, or special occasions: everyday clothes.
3. such as is met with every day; ordinary; commonplace: a placid, everyday scene.
–noun 4. the routine or ordinary day or occasion: We use inexpensive plates for everyday.

—Synonyms 2, 3. workday, common, usual.

Do basically every day is daily and everyday is common.

Here's one more for you.

“Everyday” is a perfectly good adjective, as in “I’m most comfortable in my everyday clothes.” The problem comes when people turn the adverbial phrase “every day” into a single word. It is incorrect to write “I take a shower everyday.” It should be “I take a shower every day.”

Answer 3

Everyday one word is the best.