Hebrew word for strength or power, about 130 times. Describes physical strength, capacity, or resources. Applies to human ability, natural forces, and supremely to God's limitless power.
God gives koach to the weary (Isa 40:29). He gives Israel koach to get wealth (Deut 8:18). Contrast between human and divine koach is recurring theme: 'Not by might, nor by power' (Zech 4:6).
Appears in contexts of physical exertion (Judg 16:5, Samson's strength), productive capacity (Gen 4:12), divine omnipotence (Job 26:14). Renewal of koach through waiting on the LORD (Isa 40:31) is beloved promise.