Lexical Definition

‎ἐθελοθρησκεία‎ ethelothrēskeía (eth-el-oth-race-ki'-ah) self-made religion ^G:N-F
from ‎θέλω‎ and ‎θρησκεία‎

will worship.

• voluntary (arbitrary and unwarranted) piety, i.e. sanctimony

Abbott-Smith

*† ἐθελο-θρησκία (Rec. -εία), -ας, ἡ,
self-imposed worship: Col 2:23 (eccl.; cf. DB, iv, 923a; Cremer, 733).†

Abbott-Smith References

Liddell-Scott-Jones

ἐθελοθρησκεία-θρησκεία, ἡ,

will-worship, self-chosen service, [NT]

_{LSJ Scripture Refs: Col.2.23}