definition of
AM

[1] #1 AM n. [americium, Am, atomic number 95] a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms. wn

[2] #2 AM n. [Master of Arts, MA, Artium Magister] a master's degree in arts and sciences. wn

[3] #3 AM n. [amplitude modulation] modulation of the amplitude of the (radio) carrier wave. wn