Kyūjitai form of 主体: subject

(Internet slang) uploader

main dish; main course

(dated) you (to someone of equal or inferior status)

the Creator

head of household, head of the family

the lowest of the four kan ranks in the ancient Japanese Ritsuryō system of government

the lowest of the four kan ranks in the ancient Japanese Ritsuryō system of government

(Internet slang) OP of a comment thread

(databases) primary key