The definition of spirituality can be best understood in Hinduism!
Spirituality simply means every living form primarily is spiritual... a spiritual being... a cosmic essence that manifests the cosmic system! As detailed in various sacred scriptures of world... our soul atman... the spirit within is absolute master and controller of body and not vice versa!
As per Bhagavad Gita meaning of spirituality means diving deep into inner self and realizing our true identity... our soul atman... the spirit within! It is only through path of spirituality human beings gained enlightenment (kaivalya jnana) and finally salvation (moksha). The stage of enlightenment can never be reached via path of religion... path of rituals!
We need understanding difference between
spirituality and religion. For reaching God we need traveling path of spirituality... path of absolute wisdom! God Almighty can never be reached via path of religion... path of bhakti yoga!