Exact historical dictionary sense
Opinion in Webster's 1913 dictionary
The 1913 record labels opinion as noun. Its source-bounded etymology and selected historical definition appear below.
[F., from L. opinio. See Opine.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "opinion" is labeled noun. Its etymology is recorded as: "[F., from L. opinio. See Opine.]" The selected historical definition says: "That which is opined; a notion or conviction founded on probable evidence; belief stronger than impression, less strong than positive knowledge; settled judgment in regard to any point of knowledge or action."