Who includes diversity and is Nature,
Who is the amplitude of the earth, and the coarseness and sexuality of the earth, and the great charity of the earth, and the equilibrium also,
Who has not look'd forth from the windows the eyes for nothing,
or whose brain held audience with messengers for nothing,
Who contains believers and disbelievers, who is the most majestic lover,
Who holds duly his or her triune proportion of realism,
spiritualism, and of the aesthetic or intellectual,
Who having consider'd the body finds all its organs and parts good,
Who, out of the theory of the earth and of his or her body
understands by subtle analogies all other theories,
An adjective usually used with reference to the  Holy Trinity , or the three consubstantial persons of the Christian deity. Here Whitman makes up his own trinity and makes each of us a kind of triune god.
Kosmos