media — Media is plural and should be used with a plural verb.
The media are always under scrutiny.
midnight — Do not combine “12 midnight.”
millions, billions — Use figures. Do not hyphenate. Do not drop the word million or billion in the first figure of a range.
There are 1 billion reasons why I love chocolate.
I need $4 million to $8 million.
months — see dates
multicultural — not multi-cultural
multimedia — not multi-media
music —Do not use quotation marks on descriptive titles for orchestral works.
Bach’s Suite No. 1 for Orchestra
Use quotation marks for nonmusical terms in a title or for works with a special full title.
Beethoven’s “Eroica” Symphony, “Rhapsody in Blue”
myriad — (adj.) Do not combine with “of.”
The myriad conference topics are overwhelming.