Incorrect spelling, explanation: atleast is incorrect, because it is not one word, but two (at and least), that create a phrase. Therefore we should also write them separately: at least.
Correct spelling, explanation: at least is the correct form because it is a phrase (at + least), not one word. Sometimes also at the least, this phrase means that something is the absolute minimum; at the lowest possibility; meaning also in any case. These two words, as a phrase, are also spelled separately, so atleast is incorrect.
Definition of at least:
1. phrase, at the lowest possible number or quantity
You should pay in advance for at least one night of stay in this hostel.
2. phrase, anyhow, despite problems
You could at least call me before you came!
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I guess that’s right.
After I examined a number of of the web dictionaries, I actually like your way of showing correct spelling. At this point this is my best English dictionary.