Mesomeric effect attributed to a substituent[?] in chemical compounds due to overlap of its p- or pi-orbitals with the p- or pi-orbitals of the rest of the molecular entity. The effect is symbolized by M.
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... shades of meaning. At its simplest, it refers to an adherent of a monarch or royal family.
Of the more specific uses of the term, the most common include:
1. A ...