How to say "unification" in Japanese

Choosing the right word
  • 統合とうごうJLPT N1approx.Common
    noun, suru verb, transitive verbCovers unification as merging separate bodies, systems, or elements into a single integrated whole, as when organizations, systems, or operations are combined. The emphasis is on the resulting integrated entity.
    天皇てんのうは国民こくみんの統合とうごうの象徴しょうちょうである。↗
    The Emperor is the symbol of the unity of the people.
  • 統括とうかつCommon
    noun, suru verb, transitive verbThis is really about bringing scattered activities or staff under one overall command or supervision rather than merging them into one, so it is seldom the word you want for unification in the merging sense.
  • 一元化いちげんかCommon
    noun, suru verb, transitive verb, intransitive verbCovers unification as centralization: consolidating scattered functions, procedures, or information so they are handled through a single channel or authority, as when an organization streamlines its operations.
  • 統一とういつJLPT N2approx.Common
    noun, suru verb, transitive verbCovers unification in the broadest sense: making separate things one or bringing them into uniformity, as in the political unification of a country or the unifying of rules, standards, or styles.
    スコットランドとイングランドの統一とういつは1706年ねんに行おこなわれた。↗
    The union of Scotland and England took place in 1706.

Use 統合 for merging separate things into an integrated whole, 統一 for making things one or uniform, 一元化 for centralizing scattered functions into a single channel, and 統括 for overall supervision rather than true unification.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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