per- (Latin: through, across, over; beyond, by means of).ampersand: 
antiperspirant: 
impervious: 
per annum: 
per capita: 
per cent: 
per diem: 
per mille: 
per se: 
perambulate: 
perambulated: 
perambulating: 
perambulation: 
perambulator: 
perceivable: 
perceive: 
perceiver: 
percentile: 
perception: 
perceptive: 
percipience: 
percipient: 
percolate: 
percolating: 
percolation: 
percolator: 
percussion: 
percutaneous: 
perdition: 
perennial: 
perennially: 
perfect: 
perfection: 
perfectionist: 
perfectly: 
perfidious: 
perfidiously: 
perfidy: 
perfoliate: 
perforate: 
perforated: 
perforating: 
perforation: 
perforator: 
perfume: 
perfumer: 
perfumery: 
perfunctory: 
perfuse: 
perfusion: 
perjure: 
perjurer: 
perjury: 
permanence: 
permanency: 
permanent: 
permanently: 
permeability: 
permeable: 
permeance: 
permeate: 
permeation: 
permeator: 
permissible: 
permission: 
permissive: 
permissiveness: 
permit: 
permutation: 
permute: 
perpendicular: 
perpendicularity: 
perpetrate: 
perpetual: 
perpetually: 
perpetuate: 
perpetuation: 
perpetuity: 
perplex: 
perplexity: 
perquisite: 
persecute: 
persecution: 
persecutor: 
perseverance: 
persevere: 
persist: 
persistence: 
persistent: 
persistently: 
perspective: 
perspectively: 
perspicacious: 
perspicaciously: 
perspicacity: 
perspicuity: 
perspicuous: 
perspiration: 
perspire: 
perspired: 
perspiring: 
persuade: 
persuaded: 
persuader: 
persuading: 
persuasible: 
persuasion: 
persuasive: 
persuasively: 
persuasiveness: 
pertain: 
pertinacity: 
pertinent: 
perturb: 
perturbable: 
perusal: 
peruse: 
perused: 
perusing: 
pervade: 
pervaded: 
pervading: 
pervasion: 
pervasive: 
pervasively: 
pervasiveness: 
perverse: 
pervious: 
semipermeable: 
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