אֱמוּנָה (ʾĕmûnâ) is
a Hebrew noun
meaning faithfulness. It appears
49 times
in 13 books of the Hebrew Bible
(Strong's H530).
Also rendered
firmness
steadfastness
Same Hebrew root (TWOT 116e)
Root family 116: אָמַןʾāman — to confirm, support, uphold (Qal); to be established, be faithful (Niphal); to be certain, i.e. to believe in (Hiphil). ASV, RSV usually the same. One notable exception is Gen 15:6 where RSV has “believed,” while ASV has “believed in.”)