すなわち

Used in the pattern 〜ばすなわち... to indicate that what follows is a natural consequence or logical conclusion of the preceding condition. Formal and somewhat literary.

努ど力りょくすればすなわち成せい功こうするというわけではない。
It is not the case that if you make an effort, you will then succeed.

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Grammar

つまり・すなわちin other words; that isN3

Kanji

即instant, namely, as is
則rule, law, follow
乃from, possessive particle, whereupon
便convenience, facility, excrement
輒promptly, easily, i.e.

Related words

つまりN3sense 1
つまり is the everyday, spoken word for 'that is/in other words', while 即ち is more formal and typically appears in written or academic explanations.
要ようするにN3sense 1
要するに means 'in short/to sum up' and introduces a condensed conclusion, whereas 即ち restates the same content in different, often more precise, words.
即そくN1
即ち is the common conjunction meaning 'that is to say', while 即 used this way is a rarer, more literary equivalent found in formal or classical-style writing.
それは
すなわち is a formal, written equivalent of 'namely', while それは is more conversational and used to explain or clarify.
ということは
すなわち is more formal and typically used in writing for definitions or equivalences, whereas と言うことは is common in everyday spoken conversation for drawing conclusions.

Written forms

すなわちUsage90%
Standard kana spelling; strongly preferred in modern Japanese.
即すなわちUsage8%
Common kanji form, but the word is usually written in kana. Still seen in formal or technical writing.
則すなわちUsage1%
rarely-used kanji form
Rarely used kanji form.
乃すなわちUsage<1%
rarely-used kanji form
Rarely used kanji form.
便すなわちUsage<1%
search-only kanji form
Search-only kanji form; not used in modern writing.
輒すなわちUsage<1%
search-only kanji form
Search-only kanji form; not used in modern writing.

Etymology

Derived from classical Japanese. The kanji 即, 則, and 乃 were historically used to represent the meaning, but the word is now predominantly written in kana. The exact derivation is uncertain.