[n] a tall cylindrical vertical upright
[n] a vertical structure standing alone and not supporting anything (as a monument or a column of air)
[n] a fundamental principle or practice; "science eroded the pillars of superstition"
[n] a prominent supporter; "he is a pillar of the community"
[n] anything tall and thin approximating the shape of a column or tower; "the test tube held a column of white powder"; "a tower of dust rose above the horizon"; "a thin pillar of smoke betrayed their campsite"