Hastings' Dictionary of the Bible
UNCTION . The same Gr. word as that translated ‘anointing’ in 1 John 2:27 is in 1 John 2:20 rendered ‘unction’ (RV [Note: Revised Version.] ‘anointing’). It is used there metaphorically of the effect of the presence of the Holy Spirit upon the believer.
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Hastings, James. Entry for 'Unction'. Hastings' Dictionary of the Bible. https://www.studylight.org/dictionaries/eng/hdb/u/unction.html. 1909.