About alot vs a_lot
Perhaps this common spelling error began because there does exist in English a word spelled “allot” which is a verb meaning to apportion or grant. The correct form, with “a” and “lot” separated by a space is perhaps not often encountered in print because formal writers usually use other expressions such as “a great deal,” “often,” etc. You shouldn’t write “alittle” either. It’s “a little.”
Source: http://www.wsu.edu/
