Dear Colleagues,

We are pleased to announce the second Call for Participation for SemEval-2027 Task 3: Semantic Change Across Multiple Time Periods co-located with ACL2027 in Kyoto.

SemEval-2027 Task 3 investigates how word meanings evolve across multiple historical time periods. While previous shared tasks have focused on comparisons between just two time points, this task extends the setting to ten time periods, using a multilingual benchmark of approximately 120,000 human annotations, allowing participants to model the evolution of individual word senses over time.

New Prize Announcement: The best-performing system based on open-weight models will be awarded one full ACL conference registration. The benchmark spans six languages annotated across ten time periods ranging roughly 1880–2023: Swedish, English, Italian, Spanish, Dutch, and Russian (140 words in total). The task consists of two subtasks: - Subtask 1: Diachronic Word Sense Induction – discover how word meanings evolve over time without predefined sense inventories. Evaluated via two tracks: Track 1a, Diachronic Sense Assignment (BCubed F1), and Track 1b, Sense Dynamics (Spearman's rank correlation over Jensen-Shannon Divergence). - Subtask 2: Hypothesis-Driven Change Detection – given a target sense definition, identify which usages express that sense. Evaluated via Average F1-score.

Register now to participate: https://www.codabench.org/competitions/17510/

Important Dates: - Training data ready: 1 September 2026 - Evaluation period: 10–31 January 2027        - Subtask 1: 10–21 January 2027        - Subtask 2: 22–31 January 2027 - Paper submission: February 2027 - Notification to authors: March 2027 - Camera-ready due: April 2027 - SemEval-2027 workshop: August 17 to 22, 2027, co-located with ACL 2027 in Kyoto, Japan

Additional Information: - Task website: https://www.changeiskey.org/event/2027-semeval/ https://www.changeiskey.org/event/2027-semeval/ - Mailing list: https://groups.google.com/d/forum/semeval2027-task3-SCxMTP https://groups.google.com/d/forum/semeval2027-task3-SCxMTP

Organizers: Nina Tahmasebi, Pierluigi Cassotti, Felix Morger, Lucia Siciliani, Eduardo Calò, Pablo Mosteiro, Stefano De Pascale, and Mariia Fedorova

We look forward to your participation!

Nina N. Tahmasebi, Professor Change is Key! • University of Gothenburg nina.tahmasebi@gu.se

https://changeiskey.org/ https://www.changeiskey.org/event/2027-semeval/ https://languagechange.org/ http://tahmasebi.se/ https://gu-se.zoom.us/my/ninatahmasebi

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