"a reasoning, a thought" (akin to logizomai, "to count, reckon"), is translated "thoughts" in Romans 2:15 , suggestive of evil intent, not of mere reasonings; "imaginations" in 2 Corinthians 10:5 (RV, marg., "reasonings," in each place). The word suggests the contemplation of actions as a result of the verdict of conscience. See THOUGHT.

2: διαλογισμός

(Strong's #1261 — Noun Masculine — dialogismos — dee-al-og-is-mos' )

dia, and No. 1, is rendered "imaginations" in Romans 1:21 , carrying with it the idea of evil purposes, RV, "reasonings;" it is most frequently translated "thoughts." See DISPUTE.

3: διάνοια

(Strong's #1271 — Noun Feminine — dianoia — dee-an'-oy-ah )

strictly, "a thinking over," denotes "the faculty of thinking;" then, "of knowing;" hence, "the understanding," and in general, "the mind," and so, "the faculty of moral reflection;" it is rendered "imagination" in Luke 1:51 , "the imagination of their heart" signifying their thoughts and ideas. See MIND , UNDERSTANDING.

Bibliography Information
Vines, W. E., M. A. Entry for 'Imagination'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/i/imagination.html. 1940.

Bible Dictionaries Imagination

Vine's Expository Dictionary of NT Words

Bible Dictionaries
Imagination