From the trilateral root ر-ح-م (r-ḥ-m), relating to the womb (رَحِم, raḥim) and thus to the deep, nurturing bond between mother and child. This root is among the oldest and most productive in Semitic languages, appearing in cognate forms in Hebrew (רַחֲמִים, raḥamim) and Aramaic. The connection between "womb" and "mercy" reflects the ancient idea that compassion is as instinctive and unconditional as a mother's love.

رَحْمَة is one of the most spiritually loaded words in Arabic. It forms the basis of الرَّحْمٰن and الرَّحِيم — two of the 99 names of God in Islam, meaning "The Most Gracious" and "The Most Merciful" — which appear in the Basmala (بِسْمِ اللهِ الرَّحْمٰنِ الرَّحِيم) recited before almost every Quranic chapter and daily action. As a result, even secular speakers feel a deep resonance with this word beyond its everyday meaning.