femtosecond

noun 0.723

nanosecond

noun 0.712

picosecond

noun 0.692

microsecond

noun 0.612

atomic

noun 0.541

astatine

noun 0.539

arcsecond

noun 0.539

femtomole

noun 0.535

atomic clock

noun 0.529

second of arc

noun 0.523

atom

noun 0.523

atomics

noun 0.515

subatomic particle

noun 0.514

supersonic

noun 0.511

photoelectron

noun 0.506

seconds

noun 0.505

petawatt

noun 0.504

picometer

noun 0.503

terahertz

noun 0.503