ala- (3), also al-, a prefix expressing "good" or "well" (PE17:146), as in alaquenta (q.v.) Whether Tolkien imagined this ending to coexist with the negative prefix of the same form (#2 above) is unclear and perhaps dubious.
Quenya
omen- Reconstructed
verb. to move to a common point, meet, to meet, move to a common point, *(lit.) move together
omentië
noun. meeting (of pathways), (lit.) coming together of journey-path, meeting or junction of the directions of two people
Amarië
good
ala-
good
alamen
noun. good omen on departure
mára
adjective. good
Amarië fem. name; perhaps derived from mára "good" with prefixing of the stem-vowel and the feminine ending -ië (Silm)