King James Bible Dictionary

Generally the goings out and in of social intercourse (Ephesians 2:3; 4:22; R.V., "manner of life"); one's deportment or course of life. This word is never used in Scripture in the sense of verbal communication from one to another (Psalms 50:23; Hebrews 13:5). In Philippians 1:27 and 3:20, a different Greek word is used. It there means one's relations to a community as a citizen, i.e., citizenship.

General references
Matthew 5:37; Matthew 12:35-37; Ephesians 4:29; Colossians 3:8; Colossians 4:6; James 5:12
Tongue

CONVERSATION, noun

1. General course of manners; behavior; deportment; especially as it respects morals.

Let your conversation be as becometh the gospel. Philippians 1:27.

Be ye holy in all manner of conversation 1 Peter 1:15.

2. A keeping company; familiar intercourse; intimate fellowship or association; commerce in social life. Knowledge of men and manners is best acquired by conversation with the best company.

3. Intimate and familiar acquaintance; as a conversation with books, or other object.

4. Familiar discourse; general intercourse of sentiments; chat; unrestrained talk; opposed to a formal conference.

What I mentioned in conversation was not a new thought.

[This is now the most general use of the word.]

CONVERSATIONED, adjective Acquainted with the manner of acting in life. [Not used.]