at or of a level above that which is normal or average:a high-level cistern
relating to or involving people of high administrative rank or great authority:high-level negotiations
Computing denoting a programming language that is relatively accessible to the user, having instructions that resemble a natural language such as English.
(of nuclear waste) highly radioactive and requiring long-term storage in isolation.
high-level in other Oxford dictionaries
Definition of high-level in the US English dictionary