It is the acknowledgement of excellence and perfection of an uncreated, divine person. It is the worship of the Creator that God alone deserves.
Hence Catholic writers will sometimes use the term "worship" not to indicate adoration, but only the worship of veneration given to Mary and the saints. Mark Miravalle, S.T.D, What is Devotion to Mary.
Prayer or pilgrimage are just special forms of worship; obedience to God and the attempt to assume the attributes of God as far as possible (2:138) are forms of worship which should ideally encompass every human action. See e.g.
Sikhs worship God and only one God, known as "One Creator" or (Waheguru) "Destroyer of Darkness". The Guru Granth Sahib is known as the final Sikh Guru by Guru Gohbind Singh, the 10th Sikh Guru.
Worship is evident in Buddhism in such forms as: guru yoga, mandala, thanka, yantra yoga, the discipline of the fighting monks of Shaolin, panchamrita, mantra recitation, tea ceremony, ganacakra, amongst others.
Source: Wikipedia > Worship
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