Definition
Tisri is the name used in older legal and ecclesiastical texts for the seventh month of the Jewish ecclesiastical calendar and the first month of the Jewish civil year. The month corresponds roughly to portions of September and October in the Gregorian calendar. The term appears in legal contexts primarily where instruments, deeds, contracts, or judicial records require the conversion of dates expressed in the Hebrew calendar into their common-law equivalents.
Common Language
Modern common usage (Wiktionary): An alternative form of "Tishrei," the first month of the Jewish civil year and seventh of the ecclesiastical year.
Historical common usage (Webster's 1913): "The seventh month of the Jewish ecclesiastical year, answering to a part of September with a part of October."
The common and legal meanings are essentially identical in substance. The only gap worth noting is terminological: legal and reference sources of the eighteenth and nineteenth centuries consistently use the spelling "Tisri," while modern usage has settled on "Tishrei." A researcher encountering "Tisri" in a historical legal document should not treat it as an archaic or specialized legal term of art — it is simply the period spelling of the same calendar month.
Why It Matters in Research
The practical significance of Tisri in legal research is narrow but specific: date conversion. Where historical deeds, wills, probate records, contracts, or court proceedings — particularly those touching Jewish communities in England, continental Europe, or early American settlements — record dates by the Hebrew calendar, accurate identification of Tisri is necessary to establish the Gregorian equivalent. Because Tisri straddles the September-October boundary, an imprecise conversion can place a document in the wrong month or, at the margins, the wrong year.
Researchers working with colonial American or early English legal records should also be aware that the Hebrew civil new year begins with Tisri, while ecclesiastically it is the seventh month. This dual counting — civil first, ecclesiastical seventh — appears in the Rapalje & Lawrence entry and was a standard point of clarification in nineteenth-century legal dictionaries precisely because the discrepancy created confusion when dates were cited without specifying which reckoning was used. A document citing a date in "the first month" versus "the seventh month" of a Hebrew year without further context may require additional verification.
The term does not appear in any formal legal test, doctrine, or statutory framework. Its relevance is archival and interpretive rather than doctrinal.
Historical Dictionary Support
Rapalje & Lawrence define Tisri as "the first Hebrew month of the civil year, and the seventh of the ecclesiastical, answering to a part of our September and a part of October," citing Wharton. This entry is compact and accurate. The dual civil/ecclesiastical characterization is the only substantive content, and it is the point most likely to trip up a researcher: depending on context, the same month is simultaneously month one and month seven within the Hebrew calendar tradition.
Webster's 1913 identifies Tisri only as the seventh month of the ecclesiastical year, omitting the civil-year significance. This is a meaningful omission for legal purposes, since the civil reckoning is the one more likely to govern dated instruments. Neither source addresses the spelling variation (Tisri vs. Tishrei), which is purely a matter of transliteration convention that shifted across the twentieth century.
No historical legal dictionary entry goes beyond calendar identification to discuss evidentiary or procedural treatment of Hebrew-calendar dates in common-law proceedings. Researchers needing that guidance must look to treatises on evidence or to judicial decisions addressing the authentication of foreign-dated instruments.
Jurisdictional Note
No jurisdiction-specific legal doctrine attaches to Tisri. Calendar conversion questions arising from Hebrew-dated documents are treated as factual matters, typically addressed through expert testimony or reference works, rather than as distinct legal rules.