A nonstandard spelling of 'up to', meaning as far as a certain point or limit, or indicating responsibility or choice.
Compound of 'up' from Old English upp and 'to' from Old English tō. The one-word spelling is considered incorrect in formal writing.
While 'upto' appears frequently in informal digital communication, it's technically a spelling error that even spellcheckers flag. The confusion likely stems from similar compounds like 'into' and 'onto' that are correctly written as one word.
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