A lot vs. Alot: 9 Grammatical Pitfalls
colloquial shortening of momentum, by 1896.
representing U.S. black pronunciation of more, by 1902; it was an acceptable variant form of more in the Middle Ages and has roots in Old English; see more.
Mo The symbol for the element molybdenum.
A moment: Give me half a mo (1896+)
Metal Oxide Semiconductor