co-ˈcitizen [co- 3: cf. concitizen.] Fellow-citizen. 1488Plumpton Corr. 57 Variance..betwixt my cocitisins.1868Kirk Chas. Bold III. v. i. 297 The dearest of our co-citizens.1875Stubbs Const. Hist. III. xx. 417 The lord mayor and thirteen ‘co-citizens’..chose two citizens.