From shabbath; a sabbatism or special holiday -- rest, sabbath.
see HEBREW shabbath
H7677. shabbathon
שַׁבָּתוֺן noun masculine sabbath observance, sabbatism; — ׳שׁ Exodus 16:23 10t. P; usually phrase שַׁבָּתוֺן שַׁבַּת sabbath of sabbatic observance; —
1 of weekly sabbath Exodus 31:15; 35:2; Leviticus 23:3; Exodus 16:23 (קֹדֶשׁ שַׁבַּת שַׁבָּתוֺן, probably transposed).
2 day of atonement Leviticus 16:31; 23:32.
3 sabbatical year Leviticus 25:4; compare שַׁבָּתוֺן שְׁנַת 25:5.
4 ׳שׁ alone of feast of trumpets Leviticus 23:24, and of first and eighth days of feast of tabernacles 23:39; 23:39.