Bible Dictionary · S
Solemn meeting
(Isa 1:13), the convocation on the eighth day of the Feast of Tabernacles (Lev 23:36; Num 29:35, R.V., “solemn assembly;” marg., “closing festival”). It is the name given also to the convocation held on the seventh day of the Passover (Deut 16:8).
From Easton’s Bible Dictionary (1897), by Matthew George Easton.