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Q&A

How did "as" amass all its confusing "broad and vague meanings"?

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as. Do not use the conjunction as when you mean “since,” “because,” “when,” or “while.” Its broad and vague meanings can create confusion. For example, As a potential work stoppage threatened to block the opening of school, the arbitrators revised the wording of the contract. Does as mean “when,” “because,” or “while”?

Bahrych, Merino. Legal Writing and Analysis in a Nutshell 5th edition (2017). 343:

“since,” “because,” “when,” or “while”

areN'T completely synonymous. For example "since" can mean "because", but "because" can't mean "since". E.g. General Electric is the only company that has retained its place on the DJIA under its original name since because the index's inception.

as [12]

Ultimately, as is the same word as also. Old English alswā ‘in just this way’ was used in some contexts in which modern English would use as, and as it was weakly stressed in such contexts it gradually dwindled to als or ase and finally to as.

John Ayto, Word Origins (2005 2e), p 37. Etymonline doesn't answer my question.

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We are talking about the 17th most common word in current English - it is a very successful member of the language, and also a constituent of many idioms, and most of those idioms have a single meaning each. I will ignore the idioms and also the few distinct meanings which "as" can have as a noun, preposition, or adverb, because any of those are perhaps easy to distinguish grammatically and thus they are non-problematic in legal writing[1], and the quoted resource only objects to overuse as a conjunction.

"As" has semantic overlaps with "when", "once", "because", "since", "while" and "like", but it does not exhaust the meanings of any of those.

...since the index's inception. 

You can't use "as" here.

When did you clean your teeth?

Nor here.

Let's simplify the playground a bit.

It is perhaps fair to forget about "since" altogether, because the contexts where "as" can be substituted for "since" do not exceed those where one could first substitute "because" for "since" and only then "as" for "because".

Analogously, we could perhaps forget also about "when", in favor of "once" and "while". It's good to realize that "as" and "when" are often used contrastively: "when" suggests a causal relationship beyond the temporal one, whereas "as" suggests that the simultaneity or the tight sequence of the two events was coincidental.

So we are left with "because", "once", "while" and "like". It is always tricky to try to identify meanings using other words (which can be polysemic themselves, or semantically overlapping with each other), but so far it seems that "as" as a conjunction includes a causal meaning and one or two temporal ones.

Now it's time to realize that the causal meaning of "as" subtly differs from that of "because"[2]. "Because" puts the focus on the cause. "As" puts the focus on the result. So while some kind of causality is still implied, "as" is the one, between those two conjunctions expressing causality, which is closer to the temporal meanings "once" or "while", and further away from temporal meaning of "before".

I am hoping that this exercise is showing that while "as" as a conjunction is undoubtedly quite broad (and thus sometimes vague), it is not scattered to several completely unrelated meanings. The single, albeit broad, underlying meaning of sameness or commonality[3] derives from Middle English "as" meaning "so"[4].

I assume (without any solid proof) that the 13th century "as" (meaning "so") became the second part of 15th century "whenas" (meaning roughly "when" or more exactly "once" or "while") which was later contracted to "as" (meaning "once" or "while"). However, the temporal meaning existed[5] in Middle English already before this development, so it might be more accurate to say that "whenas" was a temporarily available synonym helping to distinguish the original pronominal/adverbial/conjunctive meaning of "so" from the nascent conjunctive meaning of "when".

Whether the causal meaning evolved directly from the underlying meaning of "sameness" independently, or from the temporal meaning, I was not able to find out.

Let me also remark that the German cognate "als" walked a similar route through Old High German "also". It has a similar range of meanings (excluding the causal meaning). I think that it means that the potential of "same" or "like" for being used as "at the same time" could well have been prehistoric.


  1. I hope that it is obvious that standards of legal writing may be different from general standards of spoken or written English and that it is clear that polysemy is a rather common phenomenon with frequently used (and therefore successful) words. ↩︎

  2. Here you can see that I have done the causal "as" a disservice when I have eliminated "since" from the list of synonyms; the causal "since" is a closer match than "because". My priority was to get the temporal meaning of "since" out of the way, while "because" was conveniently narrower. ↩︎

  3. Explained by rocketman0739 here rather well ↩︎

  4. "as" is a a contraction of Old English "alswa" where "swa" is the comparative morpheme. ↩︎

  5. Clerke's Tale, verse 232: "And as she wolde over hir threshfold goon, The markis cam and gan hir for to calle[.]" ↩︎

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