Source : Webster's Revised Unabridged Dictionary (1913)

Purity \Pu"ri*ty\, n. [OE. purete, purte, OF. purt['e], F.
   puret['e], from L. puritas, fr. purus pure. See {Pure}.]
   The condition of being pure. Specifically:
   (a) freedom from foreign admixture or deleterious matter; as,
       the purity of water, of wine, of drugs, of metals.
   (b) Cleanness; freedom from foulness or dirt. ``The purity of
       a linen vesture.'' --Holyday.
   (c) Freedom from guilt or the defilement of sin; innocence;
       chastity; as, purity of heart or of life.
   (d) Freedom from any sinister or improper motives or views.
   (e) Freedom from foreign idioms, or from barbarous or
       improper words or phrases; as, purity of style.

Source : WordNet®

purity
     n 1: being undiluted or unmixed with extraneous material [syn: {pureness}]
          [ant: {impurity}]
     2: the state of being free from sin or moral wrong; lacking a
        knowledge of evil [syn: {sinlessness}, {innocence}]
     3: a woman's virtue or chastity [syn: {honor}, {honour}]