That’s Tanaka’s older sister standing in the center.
I’m waiting for you at the central ticket gate of Osaka station.
I have a little dent in the center of my head.
The middle of the central... that is really, really in the center if you ask me (and is very central as well). This is one of those "overdid it on the meaning" words.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.