MMR
noun1
Abbreviation, Initialism Initialism of measles, mumps, rubella.
2
Immunology, Medicine, Sciences The combined vaccine against those three diseases; the MMR vaccine.
3
Abbreviation, Initialism Initialism of maintenance margin requirement.
4
Video games Abbreviation, Initialism Initialism of matchmaking rating, used in matching players for games.
5
Computing, Engineering, Mathematics, Natural sciences, Networking, Physical sciences, Sciences Abbreviation, Initialism Initialism of meet-me room.