Retrospect, v. i.
Etymology: [L. retrospicere; retro back + specere, spectum, to look. See Spy, and cf. Expect.]
To look backward; hence, to affect or concern what is past. It may be useful to retrospect to an early period. A. Hamilton.
1 other Webster entry under this spelling
Retrospect, n.
A looking back on things past; view or contemplation of the past. Cowper. We may introduce a song without retrospect to the old comedy. Landor.
Shades of meaning
Fernald has no entry of its own for retrospect; he lists it under memory.
He lists it without comment; the entries above explain its neighbors.