すなわち

すなわち
conjunction
namely, that is to say
1. namely, that is, in other words
Used to clarify or restate something in different words.
これは日本(にほん)首都(しゅと)、すなわち東京(とうきょう)です。
This is Japan's capital, namely Tokyo.
(かれ)(わたし)(ちち)(おとうと)、すなわち叔父(おじ)です。
He is my father's younger brother, that is, my uncle.
A=B、すなわちB=Aである。
A=B, in other words, B=A.
(かれ)社長(しゃちょう)息子(むすこ)、すなわち(つぎ)後継者(こうけいしゃ)だ。
He is the president's son, that is to say, the next successor.
国民(こくみん)代表(だいひょう)、すなわち国会(こっかい)議員(ぎいん)法律(ほうりつ)(つく)るのが民主主義(みんしゅしゅぎ)基本(きほん)だ。
It is a fundamental principle of democracy that representatives of the people, namely members of parliament, create laws.

すなわち is a formal conjunction used for clarification or equivalence.

REGISTER:
Formal/written. Common in academic writing, explanations, and formal speech. For casual speech, use つまり instead.

SIMILAR EXPRESSIONS:

  • すなわち: namely, that is (formal, precise equivalence)
  • つまり: in other words, that is (neutral, summarizing)
  • ()()えれば: in other words (literally "if I rephrase it")
  • (よう)するに: in short, basically

KANJI FORM:
Sometimes written as (すなわ)ち, though hiragana is more common.