apace
Etymology: "a step" about 1280, from Old French pas, from Latin passus, "a step"; literally, the past participle of pandere, "to stretch (the leg), to spread out"; also from Gkreek, petalon, "a leaf".
astrocompass
A device for determining direction by celestial observation.
compass
compasses
encompass
encompasser
expand
expander
expanse
expansibility
expansible
expansibleness
expansibly
expansion
expansionism