"Nothingness; vanity. (1.) Hosea speaks of the "high places of" "Aven" (10:8), by which he means Bethel. He also calls it" "Beth-aven, i.e., "the house of vanity" (4:15), on account of the" golden calves Jeroboam had set up there (1 Kings 12:28). "(2.) Translated by the LXX. "On" in Ezek. 30:17. The Egyptian Heliopolis or city of On (q.v.). "(3.) In Amos 1:5 it denotes the Syrian Heliopolis, the modern Baalbec.

"(Heb. goel, from verb gaal, "to be near of kin," "to redeem")," the nearest relative of a murdered person. It was his right and "duty to slay the murderer (2 Sam. 14:7, 11) if he found him" outside of a city of refuge. In order that this law might be "guarded against abuse, Moses appointed six cities of refuge (Ex." "21:13; Num. 35:13; Deut. 19:1, 9). These were in different parts" "of the country, and every facility was afforded the manslayer" that he might flee to the city that lay nearest him for safety. Into the city of refuge the avenger durst not follow him. This arrangement applied only to cases where the death was not premeditated. The case had to be investigated by the authorities "of the city, and the wilful murderer was on no account to be" "spared. He was regarded as an impure and polluted person, and" was delivered up to the goel (Deut. 19:11-13). If the offence "was merely manslaughter, then the fugitive must remain within" the city till the death of the high priest (Num. 35:25).

See where Aven occurs in the Bible...

Definition of Aven:
"iniquity; force; riches; sorrow"