The terms pattern, peak, line, and transition are located at the heart of the NMR vocabulary (Figure ). Their appropriate and consistent use is required to reflect the modularity of the physical principles (Figure ) encoded into NMR spectra and to maintain proper rigor for the use of (q)NMR spectroscopy as a primary analytical tool. The definitions provided in Section 2 clarify the distinct meaning of the terms and are presented as a consensus proposal for broader discussion and adoption.