ambiguity
ambivalence
biformity
bifurcation
conjugation
dichotomy
doubleness
doublethink
doubling
dualism
duality
duplexity
duplication
duplicity
equivocality
halving
irony
pairing
polarity
twinning
two-facedness
twoness
roman deity
Anus
Pandanus
anus
gayness
heinous
pandanus