It was PURE coincidence/chance that we met/ PURE mathematics, PURE economics/ He invited me up to his flat for coffee, but I didn't think that his motives were entirely PURE (Behavin in a way tht is morally good,esp in things related t sex)
complete;only/ Refer t an area f study tht is studied only fo the purpose f developin theories abt it,nt fo the purpose f usin those theories in a practical way