ma'u zei majga zei-lujvo

x₁ is massive/has positive mass.

jbovlaste

On affix form:

makcu: x₁ is mature/ripe/fully-grown/adult in development-quality x₂ (ka).
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:

zmana'u: z₁=n₁ is a positive number relative to origin z₂.
tcaxe: x₁ (object) has charge x₂ (number) in units x₃ for interaction/of type x₄ and in/by/using convention x₅
no'e'u (exp!): digit/number: liminal zero; neither positive nor negative
rai'i (exp!): mekso (2 or 3)-ary operator: maximum/minimum/extreme element; ordered list of extreme elements of the set underlying ordered set/structure X₁ in direction X₂ of list length X₃ (default: 1)
si'i'ai (exp!): digit/number: a finite/bounded number, finitely many.
te'i (exp!): at a point on time axis
xo'ei (exp!): unary mekso operator: produces a string of n consecutive "xo'e"'s, treated as digits (concatenated into a single string of digits)
ionti: x₁ is an ion of radical/(atom of element)x₂ with x₃ charges
trendelenburge: x₁ (humanoid body) is in (reverse) Trendelenburg position with the feet higher than the head by x₂ (angle measurement, measured relative to the horizontal; units must be specified).
zenbaje: x₁ (experiencer/function) increases/gains/is incremented/augmented in property/quantity x₂ such that it achieves/had achieved having that property at 'time' x₃ (abstraction, number) according to standard x₄
zmaumce: x₁ (li) is a bound on set x₂ (set) in direction x₃ (li) in ordered structure x₄; x₁ bounds x₂ from the x₃ side in x₄; x₂ is bounded from the x₃ side by x₁.
ni'u zei ionti: x₁ is an anion of radical/(atom of element)x₂ with x₃ charges.
ni'u zei namcu: x₁ is a negative number (less than zero (0)), understood as a member of an ordered set with additive identity, such as the typical structure on the set of all real numbers.