Leviticus 23:36עֲצֶרֶת
For seven days you are to present a food offering to the LORD. On the eighth day you are to hold a sacred assembly and present a food offering to the LORD. It is a solemn assembly; you must not do any regular work.
Numbers 29:35עֲצֶרֶת
On the eighth day you are to hold a solemn assembly; you must not do any regular work.
Deuteronomy 16:8עֲצֶרֶת
For six days you must eat unleavened bread, and on the seventh day you shall hold a solemn assembly to the LORD your God, and you must not do any work.
2 Kings 10:20עֲצָרָה
And Jehu commanded, “Proclaim a solemn assembly for Baal.” So they announced it.
2 Chronicles 7:9עֲצָרֶת
On the eighth day they held a solemn assembly, for the dedication of the altar had lasted seven days, and the feast seven days more.
Joel 1:14עֲצָרָה
Consecrate a fast; proclaim a solemn assembly! Gather the elders and all the residents of the land to the house of the LORD your God, and cry out to the LORD.

Brown-Driver-Briggs

עֲצָרָה, עֲצֶ֫רֶת n.f. assembly

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.