All Though vs. Although
“Although” is a single subordinating conjunction. Writing “all though” for that conjunction is a word-boundary error, although the separate words “all” and “though” can occasionally appear next to each other for unrelated grammatical reasons.
Use “although” as the conjunction meaning “despite the fact that.” “All though” is not an alternative spelling of that conjunction.
Key details
Choose the right form
| Meaning / structure | Use | Reason |
|---|---|---|
| Conjunction meaning “despite the fact that” | although | This is the single conjunction. |
| The separate words happen to meet for independent grammatical reasons | all though | Possible only when “all” and “though” have separate jobs; it is not an alternate spelling of the conjunction. |
| Ordinary concessive clause | although / though | Choose the actual conjunction, not a split spelling. |
Quick tests
Conjunction test
Can the expression be replaced by “despite the fact that”?
If yes: Write “although” as one word.
If no: If “all” and “though” are separate grammatical words, analyze the sentence normally rather than joining them automatically.
Caveat: The existence of rare adjacent “all though” sequences does not make “all though” a spelling variant of “although.”
Examples
Although the train was late, we arrived before noon.
The concessive conjunction is one word.
All though tired, they continued.
Better: Although tired, they continued.
This incorrectly splits the conjunction.
Although brief, the note was clear.
The one-word conjunction introduces the concession.
Further guidance
Core difference
Use the single word “although” when you mean “despite the fact that” or introduce a concessive subordinate clause.
Fast Test
If the phrase can be replaced by “even though” at the start of a concessive clause, write “although” as one word.
Usage Boundary
Do not automatically join every adjacent “all” and “though”: they can occur as separate words when each has its own grammatical job, but that is not a variant spelling of “although.”
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- ALTHOUGH — Cambridge Dictionary (opens in a new tab)Cambridge University Press & Assessment · Direct dictionary and grammar evidence for although as a single subordinating conjunction.
- THOUGH — Cambridge Dictionary (opens in a new tab)Cambridge University Press & Assessment · Direct dictionary and grammar evidence for though as a conjunction/adverb, supporting the boundary between although and separate all + though sequences.