definition of
pillar

[1] #1 pillar n. a fundamental principle or practice; "science eroded the pillars of superstition". wn

[2] #2 pillar n. [column, tower] 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". wn

[3] #3 pillar n. [mainstay] a prominent supporter; "he is a pillar of the community". wn

[4] #4 pillar n. [column] a vertical cylindrical structure standing alone and not supporting anything (such as a monument). wn

[5] #5 pillar n. [column] (architecture) a tall vertical cylindrical structure standing upright and used to support a structure. wn