Probably clear, without blockage or obstruction. Either in the sense of making something visible/manifest or in the sense of something being made smooth without hinderance.
- Light is something that makes manifest (see definition for Light.). Oil is said to be “for the light.”
Exodus 25:6 (KJV) Oil for the light…
- John says that the Holy Spirit is an anointing. This anointing has caused us to “know all things” (see clearly).
1 John 2:20 (KJV) But ye have an unction [anointing/smearing] from the Holy One, and ye know all things.
Oil is used synonymously with “smoothness” (clear of obstruction?).
Proverbs 5:3 (KJV) For the lips of a strange woman drop as an honeycomb, and her mouth is smoother than oil: