Modern Orthodox

Rav Schachter in a recent shiur was asked to explain what Modern Orthodoxy is. He explained that in the olden days people didn't wear ties. Today one is considered dressed up when he wears a tie. So to be Modern Orthodox means [among other things], to wear a tie for davening. In general, one always has to see how to serve Hashem best in our generation and in that way he is a true Modern Orthodox Jew.

Halevai that everyone would have the same definition.