Māna: 'conceit', pride, is one of the 10 mental chains binding to existence see: samyojana It vanishes completely only at the entrance to Arahantship, or Nobility cf. asmi-māna It is further one of the latent tendencies see: anusaya and defilements see: kilesa
The equality-conceit māna the inferiority-conceit omāna and the superiority-conceit atimāna this threefold conceit should be overcome. For, after overcoming this threefold conceit, the monk, through the full penetration of conceit, is said to have put an end suffering; A. VI, 49.
Those ascetics and brahman priests who, relying on this impermanent, miserable and transitory nature of materiality, feelings, perceptions, mental constructions and consciousness, fancy: 'Better am I', or 'Equal am I', or 'Worse am I', all these imagine thus through not understanding reality; S. XXII, 49.
In reality no ego-entity is to be found. Cf. anatta
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.