x_{1} is exactly/approximately (1/x_{2)}-th-portion [li] of x_{3} by standard x_{4}.

Analogous to xadba, but where the fraction is specified. x_{2} must be positive; use fractions in order to denote (n/m)-ths of something (where x_{2 }= m/n, in such a case). Typically (but not necessarily), x_{2} will be filled by rational numbers (and, often, these will be integers greater than 1). Examples: "a/one whole" = "xonba be li pa"; "one-third" = "xonba be li ci"; "two-thirds" = "xonba be li ci fi'u re"; "a quarter/one-fourth" = "xonba be li vo", etc. . See also: xadba (= "xonba be li re"), tezda (= "xonba be li te'o" when in the default mode).

- grixonbybi'otei
- x
_{1 }= t_{1}is the elapsed time required for decaying/diminishing/reducing/shrinking population x_{2 }= g_{1}to decrease in number by a factor of exactly/approximately 1/(x_{3)}from that which is considered to be the initial population size, where x_{3}[li; default: 1] is a positive real number, according to standard/under condition/by model/in experiment x_{4}; x_{1}is the (x_{3^(-1))}-th-life of population/sample x_{2}; the (approximate) one-x_{3}-th-ing/(x_{3)}-fold decrease(/increase) of population x_{2}takes approximately x_{1}(time). - tezda
- x
_{1}is exactly/approximately 1/e^(x_{2)}-th of x_{3}by standard x_{4}, where e is the natural exponential base; x_{1}is x_{2}[li; default: 1] e-fold decreases in x_{3}; x_{1}is a portion of x_{3}apportioned by a factor of the (x_{2)}-th power of 1/e