annularity|ænjuːˈlærɪtɪ| [f.prec. + -ity.] Annular quality, condition or form. 1851–9Airy in Man.Sc.Enq. 3 The times of beginning and end of the annularity can be obtained accurately.1869J. Rogers in Eng.Mech. 18 June 286/1 The nebula in Lyra, the annularity of which was very apparent.