At a great altitude.

synoniem: high.

Roget 206: on high, high up, aloft, up, above, aloof, overhead; airwind^†; upstairs, abovestairs^†; in the clouds; on tiptoe, on stilts, on the shoulders of; over head and ears; breast high.    over, upwards; from top to bottom etc. (completely) 52.    ... meer laten zien