כלומר, זאת אומרת, כאמור

Every language needs a way to say a thing twice — once as it came out, and once as it should have come out. Hebrew has a whole ladder of words for that single move, and the rungs are not interchangeable: which one you reach for tells your listener how formal the exchange is. One item on this page, כאמור, is not on the ladder at all. It looks like the others and does something quite different.

The inventory

כלומר is Mishnaic, and it is not "the formal one"

Hebrew Wiktionary points it כְּלוֹמַר and marks the pronunciation klomar — final stress, so klomár, not KLO-mar. It analyses the formation as כְּ־ + לאמר, "as if to say", which is exactly what the word does. And it files the first sense, פירוש הדבר, in the חז״ל layer, illustrating it from Mishnah Sanhedrin 6:4.

That layer tag is worth stopping on, because the usual textbook framing — כלומר formal, זאת אומרת informal — does not survive it. A Mishnaic-layer word is not automatically a high-register word; Mishnaic Hebrew is the layer that most of ordinary modern Hebrew came out of. And the same entry gives כלומר a second sense — drawing a conclusion from what was just said — and tags that one משלב עממי, a popular-register label. One word, two senses, two very different heights.

זאת אומרת: the spoken twin, and the question

זאת אומרת is the workhorse. It is frozen: זאת is feminine, so the participle is permanently אומרת and never agrees with anything in your sentence — the discourse markers overview takes that apart in detail.

Its second job has no single-word English equivalent. Israelis use זאת אומרת as a question that checks an inference out loud: you take what the other person just said, spell out what it implies, and hand it back for confirmation. English does this with a whole clause — so what you're telling me is… — where Hebrew does it with two words.

כאמור points backwards, not sideways

Everything above restates what you have just said. כאמור does something else: it flags material as already established earlier in the same document. It is a cross-reference, not a reformulation, which is why it cannot open a text and cannot introduce anything new.

Milog glosses it כפי שצוין או נאמר קודם לכן — as was noted or said previously — and every illustrative sentence it carries is written: כאמור לעיל, כאמור בדוח, הנושא, כאמור, יידון בישיבה הקרובה. Pealim analyses the base אָמוּר as an adjective in the katul pattern from the root א־מ־ר, so כאמור is a frozen adverbial built on a passive-participle shape — literally "as [is] said".

No source consulted for this guide gives כאמור a register label, and none establishes any currency for it in speech. What the page can honestly tell you is that its distribution is written: reports, contracts, official letters, academic prose. That is evidence, not a label, and the difference matters.

הכוונה ש, במילים אחרות, דהיינו

הכוונה ש־ is the repair marker: you said something, it landed wrong, and you re-aim it. It is the most conversational item here and the one that most clearly signals I am correcting my own sentence, not yours.

במילים אחרות is register-neutral and slightly emphatic — it announces that the reformulation is the point, so it works in a lecture and in an argument alike.

דהיינו is Aramaic, and it belongs to written Hebrew. Milog points it דְּהַיְינוּ and glosses it i.e., namely; its illustrative sentences are all of the notice-board kind (הישיבה נדחתה לשבוע הבא, דהיינו ליום שני). Note that its restatement is often a bare phrase rather than a clause. No source consulted here gives דהיינו an etymology at all. The transparent parse — Aramaic דְּ־ ("that/which", the Aramaic equivalent of ש־) plus היינו — is a useful memory hook and this guide offers it only as that, not as a sourced derivation.

One sentence, four heights

The same fact, restated four ways. Nothing changes except the height.

Common Mistakes

1. Believing כלומר is the formal one and זאת אומרת the sloppy one. Both of the following are good Hebrew and neither is a correction of the other. What separates them is medium — זאת אומרת is overwhelmingly a spoken thing — not correctness.

2. Using כאמור for something you have not actually said. English as it were and so to speak are vague enough to be dropped anywhere; כאמור is a pointer, and if there is nothing behind it, the reader goes looking and finds nothing. Introduce first, then כאמור later — never on first mention.

3. Putting דהיינו in a conversation. It is not wrong, it is simply the wrong medium, and the effect is of someone reading a contract aloud. In speech the same job goes to כלומר or זאת אומרת. The reverse move — carrying spoken markers into written Hebrew — is covered on written argument connectors.

4. Making זאת אומרת agree with the sentence. It never agrees. זאת is feminine and the phrase is frozen solid, no matter who or what you are talking about.

5. Treating them all as one word with four spellings. Reformulation, inference and back-reference are three different acts. כלומר does the first two, זאת אומרת does both plus the checking question, and כאמור does only the third and none of the others.

Key Takeaways

• כלומר is a Mishnaic-layer word — Hebrew Wiktionary tags sense 1 חז״ל and cites Mishnah Sanhedrin 6:4 — and its second sense, drawing a conclusion, is tagged עממי. It is not the "formal" member of the set.
• It is stressed on the last syllable: klomár.
• זאת אומרת is the spoken default and doubles as a question that checks an inference aloud. It is frozen feminine and never agrees.
• כאמור is a back-reference, not a reformulation. Milog's gloss is כפי שצוין או נאמר קודם לכן, and its distribution — not any register label — is what marks it as written.
• דהיינו is bookish written Hebrew. No source consulted here gives it an etymology; the דְּ־ + היינו parse is a memory hook only.
• Markers set the level of the sentence around them. Change the rung and the rest of the sentence has to follow.