Pure

1. Separate from all heterogeneous or extraneous matter; free from mixture or combination; clean; mere; simple; unmixed; as, pure water; pure clay; pure air; pure compassion.
2. Free from moral defilement or quilt; hence, innocent; guileless; chaste; -- applied to persons.
3. Free from that which harms, vitiates, weakens, or pollutes; genuine; real; perfect; -- applied to things and actions.
4. (Script.) Ritually clean; fitted for holy services.
5. (Phonetics) Of a single, simple sound or tone; -- said of some vowels and the unaspirated consonants.
Pure-impure ,
completely or totally impure.
Pure blue . (Chem.)
See Methylene blue, under Methylene.
Pure chemistry .
See under Chemistry.
Pure mathematics ,
that portion of mathematics which treats of the principles of the science, or contradistinction to applied mathematics, which treats of the application of the principles to the investigation of other branches of knowledge, or to the practical wants of life.
Pure villenage (Feudal Law),
a tenure of lands by uncertain services at the will of the lord.