"act of forming into regiments; state of being formed into classified systems," 1856, noun of action from regiment (v.).
Entries linking to regimentation
regiment v.
"to form into a regiment" with proper officers, hence "to organize, bring under a definite system of authority," 1610s, from regiment (n.). General sense of "organize systematically" is from 1690s. Related: Regimented; regimenting.