The word "Lojban" means "
logic-
language", but that only means that
it is based on first order
logic, and has a
grammar based on
predicates. It does not
imply that the language is more
rational than others.
In fact, the Lojban vocabulary has some rather odd quirks. For instance, all words
that refer to animals, are based on the same place structure pattern. Except three animals
(guess which!): tigers, sheep, and human beings.
There has been a rather lengthy discussion on their mailing list, where some people argued
that the word know should not be a concept of its own, as it has two meanings
collapsed into one: "x1 knows x2" is equivalent in meaning
to "x1 is convinced that x2 is true AND x2 is
actually true".
Lojban experts have also recently concluded that the word botpi (bottle) should
only be used to refer to bottles that contain something.