(f.); idol worship or, in general, worship of anything other than G-d; for example, worship of the sun or the moon or the stars or a particular river, or man-made objects, such as statues of various kinds. King David describes the contrast between HaShem and idols in "Tehilim"/Psalms 115:3-8:

"Our G-d is in the heavens; whatever he pleases, he does. Their idols are silver and gold, the handiwork of man. They have a mouth, but cannot speak; they have eyes, but cannot see. They have ears, but cannot hear; they have a nose, but cannot smell. Their hands - they cannot feel; their feet - they cannot walk; they cannot utter a sound from their throat!"

"Those who make them should become like them, whoever trusts in them!"

This definition is in context to Judaism. See more contextual defintions for "Avodah Zarah".