Lexical Definition

‎עָצוּם‎ ʻâtsûwm (aw-tsoom') mighty ^H:A
or עָצֻם ʻâtsum (aw-tsoom'); passive participle of ‎עָצַם‎

[phrase] feeble, great, mighty, must, strong.

• powerful (specifically, a paw)
• by implication, numerous

1) mighty, vast, numerous
1a) mighty, strong (in number)
1b) numerous, countless

See Greek: βαρύς · δυνάστης · δυνατός · ἰσχυρός · μέγας · πλῆθος

Brown-Driver-Briggs

Also see: עַצֻּמָה

‎עָצוּם‎₃₁ adjective mighty, numerous; — ‎׳‎‎ע‎ Gen 18:18 +, plural ‎עֲצוּמִים‎ Isa 8:7 +, ‎עֲצֻמִים‎ Mic 4:3 +; suffix ‎עֲצוּמָיו‎ Ps 10:10 —

1. mighty, especially of people, strong in numbers (often || ‎רַב‎, ‎גָּדוֺל‎) Gen 18:18; Exod 1:9 + 3 t. J E; Deut 4:38 + 6 t. D, Mic 4:3; Mic 4:7; Zech 8:22; Isa 60:22 (opposed to ‎צָעִיר‎), of locusts Joel 1:6; Joel 2:2; Joel 2:5, compare vJoel 2:11 so of ‎חַיִל‎ Dan 11:25 ‎עַם לאֹ עָצוּם‎, i.e. feeble Prov 30:26 (of the ‎שָׁפָן‎); less often of individual ‎׳‎‎מְלָכִים ע‎ Ps 135:10 of waters Isa 8:7 ‎׳‎‎ע‎ alone Prov 18:18 the mighty, Dan 8:24; Ps 10:10 his mighty ones i.e. claws, of lion, so Ew De Che Bae and others).

2. numerous, countless (all || ‎רַב‎): Amos 5:12; Ps 35:18 as substantive = many Isa 53:12; Prov 7:26. — Isa 41:21 see ‎עֲצֻמָה‎ below III. ‎עצם‎. below

III. ‎עצם‎ (√ of following, si vera lectio; compare Arabic defend, protect, defence, see Du and compare Thes; > De Di and others your mighty things strong arguments (from ‎עָצוּם‎, below I. ‎עצם‎, which following perhaps imitates in vocalization)).

Brown-Driver-Briggs References