PREFIX
con - with, together
ex - out, away, from
in - in, into, not
re - back, again

ROOT
tract - drag, draw out, pull
vinc - conquer

SUFFIX
-ible - able to be
-ion - state, quality, act

WORDS AND DEFINITIONS
contraction - act of drawing together or shrinking
extraction - process of withdrawing, pulling out
retract - to draw or pull back
convince - to persuade by argument or evidence
invincible - unbeatable; impossible to overcome