Chichi (父) means "my father." It is specifically used when you are talking about your own father to someone outside your family. When speaking directly to your father or when referring to someone else's father, you would typically use the more polite term "otōsan" (お父さん). Example: 私の父は会社員です。(Watashi no chichi wa kaishain desu.) = My father is an office worker.

自分(じぶん)の父親(ちちおや)を、家族(かぞく)以外(いがい)の人(ひと)に話(はな)す時(とき)に使(つか)います。例(れい)：私(わたし)の父(ちち)は会社員(かいしゃいん)です。