Definitions of votary:

• noun:   a devoted (almost religiously so) adherent of a cause or person or activity

  Example: "The cultured votary of science"

• noun:   a priest or priestess (or consecrated worshipper) in a non-Christian religion or cult

  Example: "A votary of Aphrodite"

• noun:   one bound by vows to a religion or life of worship or service