The three preternatural gifts are those which Adam and Eve
received when they were first created by God in the Garden of Eden,
i.e. - gift of immortality (freedom from death), gift of integrity
(by which they did not suffer adverse temptations to sin, because
their bodily emotions were perfectly controlled by their will), and
the gift of infused knowledge (they did not have to study and learn
about God and nature, but had a clear understanding given to them
of all things, since they were to be the first teachers of all the
rest of mankind).
These are called preternatural, because they are beyond (praeter
means beyond) our nature as human beings. The gift of grace is
called supernatural (super means above) because it is completely
above all created being whatsoever.
These preternatural gifts were all lost when our first parents
fell into sin.