Semi-autos now "assault" weapons/rifles and definition now includes APPEARANCE, not function, according to MW Dictionary
assault weapon - Updated on: 15 Apr 2018
"any of various automatic or semiautomatic firearms; especially : assault rifle"
assault rifle - Updated on: 14 Apr 2018
"any of various intermediate-range, magazine-fed military rifles (such as the AK-47) that can be set for automatic or semiautomatic fire; also : a rifle that resembles a military assault rifle but is designed to allow only semiautomatic fire"
militia - Updated on: 11 Apr 2018
"1a : a part of the organized armed forces of a country liable to call only in emergency The militia was called to quell the riot.
1b : a body of citizens organized for military service
2 : the whole body of able-bodied male citizens declared by law as being subject to call to military service"
Absent are common definitions from other authorities:
https://www.collinsdictionary.com/us/dictionary/english/militia"2. US
in the U.S., all able-bodied male citizens between 18 and 45 years old who are not already members of the regular armed forces: members of the National Guard and of the Reserves (of the Army, Air Force, Coast Guard, Navy, and Marine Corps) constitute the organized militia; all others, the unorganized militia
3.
any of various disaffected groups of citizens that are organized as to resemble an army and that oppose the authority of the federal government
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1.
a body of citizen (as opposed to professional) soldiers
2.
an organization containing men enlisted for service in emergency only"