The meaning of Convocation in the Bible
(From International Standard Bible Encyclopedia)

kon-vo-ka'-shun: A rendering for miqra' chiefly in the frequent "Holy Convocation"; but the word is sometimes used alone, e.g. Numbers 10:2; Isaiah 1:13; Isaiah 4:5. On a holy convocation no work could be done. The phrase differs from "solemn assembly," which in the Pentateuch is only applied to the concluding festivals at the end of Passover and Tabernacles, while "Holy Convocation" is used of the Sabbath and all the great holy days of the Mosaic legislation.

See more on the meaning of Convocation in the Bible:
Convocation {Easton's Bible Dictionary}

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