vicennium

Etymology
From, from + , from  +  +. Equivalent to.

Noun

 * 1)  A period of twenty years.

Related terms

 * (1 year), (2),  (3),  (4),  (5),  (6),  (7),  (8),  (9),  (10),  (30),  (100),  (500),  (1000),  (10,000),  (100,000),  (1,000,000)

Etymology 1
From, from +  +.

Noun

 * 1) vicennium, a 20-year period