I. ˈ ̷ ̷| ̷ ̷ ̷ ̷ adjective
1. : carried out or engaged in at a high altitude
were ordered to take to the slit trenches if the high-level attack developed — Coast Artillery Journal
2.
a. : of, involving, or engaged in by persons of high position, rank, or achievement
a high-level staff to set up and supervise a political and operational training center — S.K.Padover
time to push the proposal for a high-level conference — Drew Middleton
high-level discussions of the control of atomic energy — C.L.Sulzberger
b. : holding high position or rank
high-level government officials will meet … to discuss the outlook for aluminum — T.E.Mullaney
II. ¦ ̷ ̷ ¦ ̷ ̷ ̷ ̷ adjective
1. : of, relating to, or being a computer programming language (as BASIC or Pascal) which is very similar to a natural language (as English) and in which each statement is translated by a compiler usually into several machine-language instructions
2. : relating to or being nuclear waste that contains highly concentrated radioactive components which are extremely hazardous to the environment