Level
Blackjack
The number of values used in a card counting system. A level one counting system only uses +1 and -1, but a level two system would use +1, +2, -1 and -2, and so on. The higher the level, the harder the system is to use in practice.
Water
To make level or to cause to conform to a specified grade. Any instrument that can be used to indicate a horizontal line or plane.
Telecommunications
The absolute or relative voltage, current, or power at a particular point in a circuit or system. 2. A tier or layer of a hierarchical system, e.g., the Link-Level protocol, high-level computer language.