1. (superl.) 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. (superl.) Free from moral defilement or quilt; hence, innocent; guileless; chaste; -- applied to persons.

3. (superl.) Free from that which harms, vitiates, weakens, or pollutes; genuine; real; perfect; -- applied to things and actions.

4. (superl.) Ritually clean; fitted for holy services.

5. (superl.) of a single, simple sound or tone; -- said of some vowels and the unaspirated consonants.