What is the rule for using 'a' or 'an' before words starting with 'm'?

Use Of The A And An Questions

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What is the rule for using 'a' or 'an' before words starting with 'm'?

The rule for using 'a' or 'an' before words starting with 'm' is to use 'an' before words that have a vowel sound, and 'a' before words that have a consonant sound.