Delete this Preposition section. But it might be useful to keep this sense nonetheless (for beginners). —This comment was unsigned.
I don't get the theory of why it would be an advantage for beginners to have this and only this entry have a definition for a "preposition" which grammar books and other dictionaries don't say is a preposition. If we had some systematic "do not confuse" type usage notes, perhaps that would be advantageous. But I would like to see some evidence that it would be desirable from some other language references, preferably dictionary-like. DCDuringTALK 01:31, 26 October 2009 (UTC)
How is it a preposition? I don't think "as long as" is any part of speech is it? At best, a sentence. Mglovesfun (talk) 13:30, 26 October 2009 (UTC)
It has a superficial resemblance to a preposition in that is followed by a noun complement to form a phrase that can serve as a predicate and as an adverb as many prepositional phrases do. In the sense under challenge it does not seem to me to be a constituent of any kind, but I'm not a pro at this. CGEL actually labels the senses we have under as long as#Conjunction as prepositional, though AHD and MWOnline agree with us. DCDuringTALK 16:11, 26 October 2009 (UTC)
Delete for preposition. --Hekaheka 18:32, 26 October 2009 (UTC)
Deleteas long as meaning 'the same length'. But the "conjunction", meaning 'if' is a prepositional phrase.--Brett 00:41, 28 October 2009 (UTC)