ἁγιωσύνη/hagiōsunē

This word is an idea. It is a noun.

This word means holiness. Something that has holiness is holy
- God is holy. That is, God is different from everything he created. He is perfect and deserves to be honored. He never does anything that is evil
- Something that is holy is something that God or someone has set apart and dedicated to serve God
- Someone who is holy is someone whom God or someone has set apart and dedicated to serve God.

See: Romans 1:4; 2 Corinthians 7:1; 1 Thessalonians 3:13