The state or quality of being unified, whole, or in harmony; a philosophical or spiritual concept of universal unity.
From Old English ān (one) + the suffix -ness (state, quality). The spiritual and philosophical meanings developed alongside mystical traditions that emphasized the unity of all existence.
This concept appears in virtually every major spiritual tradition, from Hindu Advaita to Christian mysticism to modern physics, suggesting a deep human intuition about the fundamental interconnectedness of reality. The word captures both mathematical unity and profound spiritual insight.
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