In the following, vowel quantities which I am uncertain of, will be marked with both a breve and a macron, so they should not be considered the answer; that is what I am searching for.
This whole investigation began with collē̆ctiō. I was surprised to see that both Gaffiot and L&S listed it as collectiō, whereas Wiktionary lists it as collēctiō. The Wikipedia entry lists it as following:
- collēctiō < collēctus + -tiō, from colligō.
- colligō < con- + legō
- legō, legere, lēgī, lēctum
Gaffiot and L&S agree on 1 and 2, but on 3, they list the following:
- Gaffiot: lĕgo lēgi, lectum, ĕre
- L&S: lĕgo, lēgi, lectum
Both agree that it has no clear vowel length; they do not specify it as neither short nor long. I then tried to have a look at the PIE origin of legō via the Wiktionary entry, to see if there could be any clue there, here with the entries relevant for Latin listed:
to gather, collect, with derivatives meaning to speak
Terms derived from the Proto-Indo-European root *leǵ-
- *leǵ- (root present)
- Proto-Italic: *legō
- Latin: legō (see there for further descendants)
- Proto-Italic: *lēks
- Latin: lēx
This is about where my ability to gather clues and derive any firm conclusions stop. Thus my question: What is the correct vowel quantity for the participle of legō: lē̆ctum? Adding an explanation of why would be most helpful. I am aware of the phenomenon of creating perfect tenses by vowel lengthening, and suspect therefore that the Wiktionary entry in fact is the more precise, but am not well-enough versed in this to arrive at any conclusions myself.