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1990, David Layzer Professor of Astrophysics Harvard University, Cosmogenesis : The Growth of Order in the Universe: The Growth of Order in ... Now suppose that neutrons had some as-yet-unknown property that, if it could be observed, would enable us to predict their individual lifetimes.
Source: wiktionary
In their chapter Ellerton and Clements consider what is involved in the task of solving the equations that arise from acknowledging ignorance and using letters to stand in for as-yet-unknowns.
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.