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arXiv · 2609.35017

TermJudge: A Document-Level Metric Judging, Not Counting, Terminology in Machine Translation Evaluation

Nicolas Dahan·Fran{\cc}ois Yvon·Rachel Bawden
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Abstract

Existing automatic metrics for evaluating terminological use in machine translation (MT) penalise any divergence from a fixed reference, conflating translation errors with the valid terminological variation that human translators routinely produce. We introduce TermJudge, a document-level terminology metric that assigns an interpretable verdict to every term occurrence: glossary-conforming occurrences are settled deterministically, while divergences are assessed under a two-step LLM-as-judge procedure using the full document context: the first detects and labels terminology errors; the second sorts valid document-level variations from inconsistencies. Validated against expert error annotations and document-level human MQM scores, TermJudge ranks first in both system- and segment-level meta-evaluation, ahead of glossary-conformity and quality-estimation baselines. When applied to eight systems translating academic documents, under two prompting conditions, we observe that glossary injection improves terminology translation in all paired comparisons, by removing genuine errors rather than valid variation. TermJudge is released as open-source code.

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Nicolas Dahan, Fran{\cc}ois Yvon, Rachel Bawden. 2026-09-28. TermJudge: A Document-Level Metric Judging, Not Counting, Terminology in Machine Translation Evaluation. https://arxiv.org/abs/2609.35017

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