Alternative present participle spelling of emceeing; serving as a master of ceremonies.
Variant spelling of emceeing, following the pattern of dropping the final -e before -ing in some dialects or informal writing. Both emceeing and emceing are used, though emceeing is more standard.
The fact that people spell this two different ways (emceeing vs. emceing) shows that even though the word came from abbreviation M.C., it's still being treated as a regular modern English word with natural spelling variations.
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