Spirituality (Wikipedia):

The meaning of spirituality has developed and expanded over time, and various meanings can be found alongside each other. Traditionally, spirituality referred to a religious process of re-formation which “aims to recover the original shape of man”, oriented at “the image of God” as exemplified by the founders and sacred texts of the religions of the world. The term was used within early Christianity to refer to a life oriented toward the Holy Spirit and broadened during the Late Middle Ages to include mental aspects of life.

In modern times, the term both spread to other religious traditions and broadened to refer to a wider range of experiences, including a range of esoteric and religious traditions. Modern usages tend to refer to a subjective experience of a sacred dimension, and the “deepest values and meanings by which people live”, often in a context separate from organized religious institutions. This may involve belief in a supernatural realm beyond the ordinarily observable world, personal growth, a quest for an ultimate or sacred meaning, religious experience, or an encounter with one’s own “inner dimension”.

Spirituality (Cambridge):

the quality that involves deep feelings and beliefs of a religious nature, rather than the physical parts of life

Spirituality (Psychology Today):

Spirituality means different things to different people. For some, it’s primarily about a belief in God and active participation in organized religion. For others, it’s about non-religious experiences that help them get in touch with their spiritual selves through quiet reflection, time in nature, private prayer, yoga, or meditation.

Many people identify as spiritual but not religious: With a few exceptions, the percentage of adults who identify as religious in many industrialized countries is declining, while remaining generally high in less developed nations. Even as religious affiliation decreases, though, a sense of spiritual identification could remain steady or even increase.

Spirituality (Britannica):

spirituality, the quality or state of being spiritual or of being attached to or concerned with religious questions and values broadly conceived. The term is also frequently used in a non- (or even anti-) religious sense to designate a preoccupation with or capacity for understanding fundamental moral, existential, or metaphysical questions, especially regarding the nature of the self (or soul, or person), the meaning of life, the nature of mind or consciousness, and the possibility of immortality.