Correct spelling, definition: acing is a present participle/gerund of the infinitive to ace, which probably originates from the student slang sense of getting high marks. If we want to make a derivative of the verb, we add the regular -ing suffix to the end of it, but the process is slightly different when a verb ends with -e letter. Two vowels (-e and -i) shouldn’t be next to each other, so -e must disappear. That’s why the correct form is acing, not aceing.
Definition of acing:
noun (gerund), winning or succeeding in a competitive situation
Acing the debate wasn’t an easy thing to achieve.
She is very competitive, so she likes acing.
Incorrect spelling, definition: aceing is a misspelling because two vowels can’t occur alongside each other. If we want to create a correct form, we should replace -e letter with -i letter and then add the ending -ing, thus we get the word acing, not aceing.
Incorrect spelling
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Two vowels can’t occur alongside each other??? Look, too many vowels do so occur! Ageing, looking, took, rook, book, feeding, seeding, weeding…probably thousands more.
Whence the “two vowels” rule. Let’s really weigh their options.
Ah, that must be why it’s ‘seing’ and not ‘seeing’ then…