Wikipedia
Śāsana
Śāsana ( Sanskrit), ( Pali: sāsana) is a term used by Buddhists and Shaivites to refer to their religion or non-religion. It has a range of possible translations, including teaching, practice, doctrine and Buddha Śãsana, which means "the teaching of the Buddha" (of which there have been several). Since in Buddhism there is no divine god the term is considered more accurate than the word " religion" as it denotes an adaptable philosophy and practice rather than a non-changing divine call from an all knowing god.
Śāsana may also refer to the 5000 year dispensation of a particular Buddha. That is, we are living in the śāsana of the Śakyamuni Buddha.