These are a near anagram of 100 Across

Usage examples of precisions.

For them, the defining technology was the clock and its associated systems of gears, cogs and hydraulic transmission, which together could generate precisions of mathematically describable motion hitherto unimaginable.

Libraries of a lifetime, universes of knowledge in mathematical precisions, abstractions of refined clarity-and a door.

Asteroids mined, the stuff of them refined, nanotechnic assemblers forming titanic mirrors to precisions of micrometers, the judicious orbiting of these-no simple task, but well within present-day capabilities.