Paleo-lexicon denotes the deliberate use of archaic, obsolete, or historically distant vocabulary in poetry to evoke a sense of temporal depth, cultural memory, or linguistic authenticity; poets employ paleo-lexicon not merely for ornamentation but to reconnect with ancestral voices, reconstruct historical atmospheres, or challenge the limitations of modern diction, as exemplified in the works of Geoffrey Hill, who integrates Old English and medieval terms to interrogate moral and historical consciousness, or in Indigenous poetry that revives pre-colonial lexicons to reclaim linguistic sovereignty.

Vocabulary drawn from archaic, ancient, or proto-historical language layers, lending historical texture and authenticity to the poem. May require glosses for modern readers unfamiliar with the terms. Related to archaism and the occult vocabulary. Contrasts with contemporary diction. Learners should use paleo-lexicon purposefully and sparingly; each archaic word should justify itself by adding precision or texture unavailable in modern equivalents.