Apace

A┬Ěpace' adverb [ Prefix a- + pace . Middle English a pas at a walk, in which a is the article. See Pace .] With a quick pace; quick; fast; speedily. « His dewy locks did drop with brine apace . Spenser. » « A visible triumph of t...
Found on http://www.encyclo.co.uk/webster/A/100

Apace

• (adv.) With a quick pace; quick; fast; speedily.
Found on http://thinkexist.com/dictionary/meaning/apace/

apace

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'.
Found on http://www.wordinfo.info/words/index/info/view_unit/1568/
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