Translation unit

In the field of translation, a translation unit is a segment of a text which the translator treats as a single cognitive unit for the purposes of establishing an equivalence. The translation unit may be a single word, a phrase, one or more sentences, or even a larger unit.

When a translator segments a text into translation units, the larger these units are, the better chance there is of obtaining an idiomatic translation. This is true not only of human translation, but also in cases where human translators use computer-assisted translation, such as translation memories, and also when translations are performed by machine translation systems.

Perceptions on the concept of unit

Vinay and Darbelnet took to Saussure's original concepts of the linguistic sign when beginning to discuss the idea of a single word as a translation unit.[1] According to Saussure, the sign is naturally arbitrary, so it can only derive meaning from contrast in other signs in that same system.

However, Russian scholar Leonid Barkhudarov[2] stated that, limiting it to poetry, for instance, a translation unit can take the form of a complete text. This seems to relate to his conception that a translation unit is the smallest unit in the source language with an equivalent in the target one, and when its parts are taken individually, they become untranslatable; these parts can be as small as phonemes or morphemes, or as large as entire texts.

Susan Bassnett widened Barkhudarov's poetry perception to include prose, adding that in this type of translation text is the prime unit, including the idea that sentence-by-sentence translation could cause loss of important structural features.

German linguist Werner Koller connected Barkhudarov's idea of unit sizing to the difference between the two languages involved, by stating that the more different or unrelated these languages were, the larger the unit would be.[3]

One final perception on the idea of unit came from linguist Eugene Nida. To him, translation units have a tendency to be small groups of language building up into sentences, thus forming what he called meaningful mouthfuls of language.

Points of view towards translation units

Process-oriented POV

According to this point of view, a translation unit is a stretch of text on which attention is focused to be represented as a whole in the target language. In this point of view we can consider the concept of the think-aloud protocol, supported by German linguist Wolfgang Lörscher: isolating units using self-reports by translating subjects. It also relates to how experienced the translator in question is: language learners take a word as a translation unit, whereas experienced translators isolate and translate units of meaning in the form of phrases, clauses or sentences.

Product-oriented POV

Here, the target-text unit can be mapped into an equivalent source-text unit. A case study on this matter was reported by Gideon Toury, in which 27 English-Hebrew student-produced translations were mapped onto a source text. Those students that were less experienced had larger numbers of small units at word and morpheme level in their translations, while one student with translation experience had approximately half of those units, mostly at phrase or clause level.


  2. Barkhudarov, Leonid (1969). Urovni yazykovoy iyerarkhii i perevod (Levels of language hierarchy and translation). In: Tetradi perevodchika (The Translator's Notebooks). pp. 3–12.
  3. Koller, Werner (1992). Einführung in die Übersetzungswissenschaft (Introduction to Translation Studies). Heidelberg: Quelle & Meyer.
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