On grammatical class:

ze'a
time tense interval: a medium length of time.
ze'e
time tense interval: the whole of time.
ze'i
time tense interval: an instantaneous/tiny/short amount of time.
ze'u
time tense interval: a long amount of time.
baze'e
time tense: forever after / forevermore
ze'aba
time tense: a medium time interval offset towards the future; (tense/modal).
ze'aca
time tense: a medium time interval spanning the present; (tense/modal).
ze'apu
time tense: a medium time interval offset towards the past; (tense/modal).

In definition:

cmavrze'a
x1 is the selma'o "ZEhA".

In notes:

zilze'apuda
x1 is a part of Lojban text representing rule 'time' according to the first edition of the book 'The Complete Lojban Language'.