1) Demo unit 
In some programming languages, eval is a function which evaluates a string as though it were an expression and returns a result; in others, it executes multiple lines of code as though they had been included instead of the line including the eval. The input to eval is not necessarily a string; in languages that support syntactic abstractions (like...
• (a.) Relating to time or duration.
E'val (ē'v a l) adjective [ Latin aevum lifetime, age, eternity.] Relating to time or duration. [ Obsolete]
eval Relating to time or duration. Related 'time' units: archaeo-, archeo-; Calendars; chrono-; horo-; pre-; Quotes: Time; tempo-.