(inter)val

1. A space between two objects, points, or units.
2. The amount of time between two specified instants, events, or states.
3. One of a series of predetermined distances covered at regular time increments with intermittent periods of rest in an athletic workout.
4. Mathematics.
   1. A set of numbers consisting of all the numbers between a pair of given numbers along with either, both, or none of the endpoints.
   2. A closed interval.
   3. An open interval.
   4. A half-open interval.
   5. A line segment representing the set of numbers in an interval.
5. Chiefly British. An intermission, as between acts of a play.
6. Music. The difference, usually expressed in the number of steps, between two pitches*
   

Sgelare (3) 2008 5-delig o.i.inkt op papier 130x390x15cm.
(foto: Fred Sonnega)

interval= tussentijd
intervallum= tussenruimte, tussentijd.
inter= tussen, vallum= (verdedigings) wal.
vallis= vallei, verwijzend naar volume
volumen=draaiing, boekrol
volutum= rollen, verwijzend naar walen= keren, kenteren,
oudindisch: valati= zich wenden naar.

zie: Falling Waters

*from answers.com