cu'a zei fancu zei-lujvo

f1 is an absolute value function from domain f2 to range f3.

Defined by: f(x) = abs(x)

On affix form:

cuxna
x1 chooses/selects x2 [choice] from set/sequence of alternatives x3 (complete set).
fancu
x1 is a function/single-valued mapping from domain x2 to range x3 defined by expression/rule x4.
zekri
x1 (event/state) is a punishable crime/[taboo/sin] to people/culture/judges/jury x2.

In definition:

cmapagjvo
x1 (text) is a lujvo with meaning x2 and arguments x3, and which is constructed from tanru/veljvo x4 such that each element of the veljvo is ultimately only a cmavo (including "{zei}", "{ke}"/"{ke'e}", "{bo}", etc.), gismu, or rafsi of such cmavo or gismu.
zejvo
x1 (text) is a Lojban compound predicate using the particle “zei”; with meaning x2, arguments x3, built from metaphor (tanru) x4.
luvrzei
x1 (text) is a Lojban compound predicate using the particle “zei”; with meaning x2, arguments x3, built from metaphor (tanru) x4.
zeiljvo
x1 (text) is a Lojban compound predicate using the particle “zei”; with meaning x2, arguments x3, built from metaphor (tanru) x4.
zo si si zei fa'o
x1 is a nonsense zei-lujvo using parts x2, silly by standard x3.

In notes:

gu'au'i (exp!)
mekso operator, variable arity - algebraic structure order of X1; OR: order of/(size of) period of element X1 in algebraic structure X2 under operator/of type X3
ka'au (exp!)
mekso unary operator: cardinality (#, | |)
sei'au
terbri editor: passes the terbri value through the quoted function so that the sumti that fills it really is filling the output of the function
cu'alni
x1 is the absolute value of x2
cu'alvu'u
x1 is the absolute difference of numbers x2 and x3 ; x1 = |x2 - x