Extended Strong's Greek Lexicon (Abbott-Smith based)
to strengthen
Usage: στερεόω, -ῶ (στερεός), [in LXX: Isa.42:5 (רָקַע), Jer.5:3 (חָזַק pi.), etc. ;] __(a) to make firm or solid; __(b) to strengthen, make strong; with accusative of person(s), Act.3:16; τ. βάσεις, pass., Act.3:7. Metaphorical (cf. Je, l.with): τ. πίστει, pass., Act.16:5.† (AS)