Highest peak in ontario. (especially of things that are not living) being a large distance from top to bottom or a long…. The meaning of HIGH is rising or extending upward a great distance : taller than average, usual, or expected. lofty: a high wall. Mount Everest, known as the highest mountain on Earth, stands at 29,029 feet (8,848 meters) above sea level. , -er, -est, n. elevated: a high ledge. greater than or going beyond the usual degree, measure, or amount: high speed; high prices. Learn more. (of things) having a specified height: The tree is 20 feet high. The meaning of HIGH is rising or extending upward a great distance : taller than average, usual, or expected. v7gffjzexe1jxoj8cxjrgzpbdevujzmf6mwpviot