Strong's #2178: ephapax (pronounced ef-ap'-ax)

from 1909 and 530; upon one occasion (only):--(at) once (for all).

Thayer's Greek Lexicon:

̓́

ephapax

1) once, at once

1a) all at once

1b) once for all

Part of Speech: adverb

Relation: from G1909 and G530

Citing in TDNT: 1:383, 64

Usage:

This word is used 5 times:

 

Romans 6:10: "he died, he died unto sin once: but in that he liveth, he liveth"
1 Corinthians 15:6: "of above five hundred brethren at once; of whom the greater part"
Hebrews 7:27: "the people's: for this he did once, when he offered up himself."
Hebrews 9:12: "his own blood he entered in once into the holy place, having obtained"
Hebrews 10:10: "body of Jesus Christ once"