The value of the variable occurring with the greatest frequency in the series of observations. A bimodal distribution is one which contains two maxima. The use of mode when reporting results of chemical analysis is generally not recommended.
Sources:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2202 (https://doi.org/10.1351/pac199062112167)
PAC, 1994, 66, 595. 'Nomenclature for the presentation of results of chemical analysis (IUPAC Recommendations 1994)' on page 603 (https://doi.org/10.1351/pac199466030595)