high–level

1 :  occurring, done, or placed at a high level

2 :  being of high importance or rank high–level diplomats

3 :  of, relating to, or being a computer programming language (such as BASIC or Pascal) which is similar to a natural language (such as English) and in which each statement is translated by a compiler usually into several machine language instructions

4 :  relating to or being nuclear waste that contains highly concentrated radioactive components which are environmentally hazardous