(1):

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

(2):

(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.

(3):

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

(4):

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

(5):

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