1. Union, 2. Spiritually, it means union with God
1. Mark of Divine glory with respect to a Saint or God with all His powers, 2. Shakti (Divine Energy), beauty, virtues etc, 3. Respectful way of addressing a Deity.
In Sanskrut, the word Hindu is broken up as hin + du. 'Hin' means to remove and 'du' means darkness. In other words, anyone who makes efforts to remove the darkness of spiritual ignorance (that is, a seeker), is a Hindu.