The Dictionary Meaning of Tazkiyya
If we take the dictionary and look up the meaning of the word tazkiyya, in all its meanings, we see ‘zaka’ means “was clean”, yuzakki means”to clean,” and “to be purified.” Also ‘zaka’ means “cleansed.” ‘Tazkiyya’ is defined as “to purify, clean.” ‘Yuzakki’ means “cleanseth and purifieth” The word ‘Zakaatun’ is translated “an Islamic tax, poor-due, poor-rate or charity, but none of them renders the full meaning of the term. Thus it is reasonable to use the term as such: purity, piety.” The word ‘Azkaa’ translates as “the purest.” ‘Zakiyyatan’ means “pure, innocent”
The above definitions are found in Vocabulary of the Holy Qur’an, page 243.