A bimodal distribution means there are two distinct peaks or high points in a set of data. It suggests that there are two separate groups or categories within the data, each with their own set of values. Full definition
E, Histograms of GFP and FG normalized fluorescence intensity of individual cells showing bimodal distributions suggestive of a high - expressing population (mean GFP: 0.59, FG: 0.62) and a nonexpressing population (mean GFP: 0.08, FG: 0.08). (jneurosci.org)
Threshold was determined by fitting bimodal distributions of intensity values with two peak Gaussian functions. (jneurosci.org)
Because they presented bimodal distributions, the hospitalization and injury outcomes variables were analyzed as dichotomous variables with logistic regressions using the same hierarchical model design. (academic.oup.com)