Ofcourse

[Sonia]

an obvious misspelling of the term of course, which would signify certainty. of course is always represented in two words.

[Sarah]

A perfectly valid way to write of course regardless of what those [grammar Nazi] oppressors or [spellcheck] may prescribe. It is shorthand for the phrase: as a matter of course
Since the meaning of ofcourse does not direly follow from the individual words in of course, and since in the speech sound wave, one word runs into the next seamlessly; there are no little silences between spoken words the way there are white spaces between written words. We simply [hallucinate] word boundaries when we reach the edge of a stretch of sound that matches some entry in our mental dictionary (quoting [linguist] Steven Pinker), it is only natural for many people to assume that ofcourse is a single word.

[Lanell]

Used to introduce an idea or action as being obvious or to be expected.