Definitions for pillar

(a fundamental principle or practice; "science eroded the pillars of superstition")

(anything that approximates 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")

(a prominent supporter; "he is a pillar of the community")

(a vertical cylindrical structure standing alone and not supporting anything (such as a monument))

((architecture) a tall vertical cylindrical structure standing upright and used to support a structure)