What is the meaning of L-?

deprecated notation for levorotatory (versus modern notation, (−)).

The l-classifier, one of four classifiers which obligatorily appear in every Ahtna verb with a variety of purposes. The l-classifier has the following uses:

1. Forms the passive of (mostly transitive) verbs with the ł-classifier
2. Forms many intransitive verbs
3. Forms iterative verbs via classifier shift from the ł-classifier (with the prefix na-)

   Forms the passive of (mostly transitive) verbs with the ł-classifier

   Forms many intransitive verbs

   Forms iterative verbs via classifier shift from the ł-classifier (with the prefix na-)

   Forms reciprocal verbs

   Forms benefactive verbs

   Forms reflexive verbs

   Forms mediopassive verbs

   Forms neuter (adjectival) verbs from nouns

   Forms transitive verbs with incorporated objects

   Appears in many imitative and onomatopoeic verbs

   Appears in many verbs with no clear function

   One of four "classifier" valency prefixes mandatory on all Lower Tanana verbs. The l-classifier has the following uses:

   Forms many intransitive verbs

   ghelbeth ― it is rolling

   Forms intransitive reflexive verbs

   Forms intransitive verbs with an incorporate as their object

   With a gender prefix, forms dimensional neuter adjectival verbs.

   nadlebotth ― it is round

   With the d-qualifier, forms onomatopoeic verbs

   deldaɬ ― a crane is calling

   deltwtl ― he/she is talking loudly

   The l-classifier, one of several classifiers which obligatorily appear in every Wailaki verb, used primary to passivize transitive verbs formed with the ł-classifier.

   alternative form of il-

   the l- classifier or valence-change prefix, a detransitivizing prefix of active verbs that modifies the transitivity or valence and grammatical voice of a verb, and occurs in most passive, mediopassive, reflexive, and reciprocal verbs that are derived from verbs with a ł- classifier

   Source: wiktionary.org