a-
According to Nova Fronteira, this prefix corresponds to the Greek a-, existing in
words formed in modern languages, and presenting the notion of ‘privation’.
In Novo Dicionário, a- comes from the Latin ab(s)-, and it can be associated with the
ideas of ‘separation’ and ‘privation’, while if it comes from the Greek a- it can be related to
the notions of ‘separation’ and ‘negation’