Word:

efficiency

Noun1.efficiency - the ratio of the output to the input of any system
2.efficiency - skillfulness in avoiding wasted time and effort; "she did the work with great efficiency"
Antonyms:
inefficiency - unskillfulness resulting from a lack of efficiency
ability, able, ableness, address, adept, adeptness, adequacy, adroitness, airmanship, applicability, artfulness, artisanship, artistry, availability, bravura, brilliance, caliber, capable, capableness, capacity, cleverness, command, competence, competent, control, coordination, craft, craftsmanship, cunning, deftness, dexterity, dexterousness, dextrousness, diplomacy, effectual, efficacious, efficaciousness, efficient, experience, expert, expertise, expertness, facility, faculty, finesse, fitness, fitted, flair, functionality, genius, grace, grip, handiness, helpfulness, horsemanship, ingeniousness, ingenuity, know-how, marksmanship, masterly, mastership, mastery, operability, performance, potency, practicability, practical ability, practical utility, practicality, productivity, proficiency, proficient, profitability, prowess, qualification, qualified, quickness, readiness, resource, resourcefulness, savoir-faire, savvy, seamanship, serviceability, skill, skilled, skillful, skillfulness, style, sufficiency, susceptibility, tact, tactfulness, talent, technical brilliance, technical mastery, technical skill, technique, the goods, the stuff, timing, usability, use, usefulness, utility, utilizability, virtuosity, virtuous, what it takes, wit, wizardry, workmanship
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efferent neuron
Efferous
Effervesce
Effervescence
Effervescent
Effervescible
effervescing
Effervescive
Effet
Effete
Efficacious
efficaciously
efficaciousness
efficacity
efficacy
efficience
-- efficiency --
efficiency apartment
efficiency engineer
efficiency expert
efficiency of a heat engine
efficient
Efficient cause
Efficiently
Effierce
Effigial
Effigiate
Effigiation
Effigies
Effigy
Efflagitate
Efflate
Efflation
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