da·tum (dātəm, dătəm, dätəm)
1. pl. da·ta (-tə) A fact or proposition used to draw a conclusion or make a decision. See Usage Note at data.
2. pl. da·tums A point, line, or surface used as a reference, as in surveying, mapping, or geology.
[Latin, something given, from neuter past participle of dare, to give; see dō- in the Appendix of Indo-European roots.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.