Janus
N pole
S pole
ambiguity
ambivalence
antagonism
anteposition
antipathy
antithesis
balance
biformity
bifurcation
bilateral symmetry
clashing
collision
conflict
conformity
confrontation
confrontment
congruity
conjugation
consistency
contention
contradiction
contradistinction
contraindication
contraposition
contrariety
contrast
correspondence
counterposition
cross-purposes
dichotomy
disagreement
discrepancy
doubleness
doublethink
doubling
dualism
duality
duplexity
duplication
duplicity
dynamic symmetry
equality
equilibrium
equivocality
eurythmics
eurythmy
evenness
polar
oppositeness
opposition
alignment
comparator
conductivity
deflection
excitation
gradient
hysteresis
impedance
inverter
maturation
orientation
polarization
solubility
tachometer
torque
transformer
voltage
waveform
Solidarity
Verity
barbarity
celerity
clarity
dexterity
disparity
familiarity
hilarity
irregularity
parity
peculiarity
popularity
posterity
prosperity
rarity
regularity
similarity
sincerity
solidarity
temerity
unfamiliarity
verity