MAtra means one who is born in a BrAhmaNa family who has not undergone upanayanam and not following any ansuhthAna.
BrAhmaNa is one who has done some veda adhyayana, who has ACara, SAnti, Satyam, dayA.
Srotriya is one who has done the Veda adhyayanam of one SakhA along with kalpasUtra or six vedAngas, knower of dharma, performer of six karmas like yajanam.
anUCAna is one who is vedavedAnga tatvajna, Suddha citta, devoid of Sins and having the qualities of Srotriya.
BhruNa is one who is vrataguNopeta, follower of niyamas in yajnas and vedAdhyayana, devapitruSishtAnna BhojI, jitendriya.
Rishikalpa is one who has all vaidika and laukika jnAna, Asramastha, jitendriya.
Rishi is one who is Urdharetas, tapasvI, follower of AhAra niyama, powerful to give SApa and anugraha, satyasandha.
Muni is one who is not attached towards vishayas, knower of all tatvas, without KAma and krodha, dhyAnastha, nishkriya, jitendriya, viewer of gold or sand equally.