Lexical Definition

‎עָלַס‎ ʻâlaç (aw-las') to rejoice ^H:V
a primitive root

[idiom] peacock, rejoice, solace self.

• to leap for joy, i.e. exult, wave joyously

1) to rejoice
1a) (Qal) to rejoice
1b) (Niphal) to exult
1b1) to flap joyously (of ostrich)
1c) (Hithpael) to delight oneself

Brown-Driver-Briggs

[‎עָלַס‎] verb rejoice (|| with ‎עָלַז‎, ‎עָלַץ‎, q. v.; Late Hebrew ‎עֲלִיסָה‎ rejoicing (once Levy^{NHWB iii. 657})); —

Qal Imperfect 3 masculine singular ‎יַעֲלֹס‎ Job 20:18 he shall not rejoice. Niph`al Perfect 3 feminine singular ‎נֶעֱלָ֑סָה‎ Job 39:13 (of ostrich's wing) = flap joyously. Hithpa`el Imperfect 1 plural cohortative ‎נִתְעַלְּסָה‎ Prov 7:18 let us delight ourselves in (‎ב‎) love.

Brown-Driver-Briggs References