On gloss:

xabmapti on place 4
xa1=m1 is the mate of xa1=m2 with property m3 in pair xa2.

In definition:

jinci
x1 is a pair of shears/scissors for cutting x2.
remei (comp!)
quantified selbri: convert 2 to cardinal selbri; x1 is a set with the pair of members x2.
barkalyle'o
l1=b1 is a monocle/pair of (eye)glasses/spectacles allowing the clear sight of l2 (light) by k2 (wearer).
comgau
x1 makes x2 be in some unspecified relation with x3; x1 assigns / pairs up x2 and x3.
jincyba'e
b1 is a blade of the pair of shears/scissors j1.
le'otci
t1 is a monocle/pair of (eye)glasses/spectacles for observational activity t2.
nerpalku
x1 is a pair of underpants
rely'orsi
x1 is a sequence of 2 members: x2 and x3; x1 is an ordered pair of x2 and x3
jensi
x1 is a (set/pair) of scissors/shears/clippers/(hedge) trimmers/tongs [tool] with parts/blades x2 (scissor) and used for purpose x3
fi'au
mekso operator: continued fraction, Kettenbruch notation; for ordered input (X1, X, where: X1 is an ordered pair of functions and X2 is a free or dummy variable/input/index which ranges through set X3 in order(ing) X4, the result is K(X for Kettenbruch notation K.
po'i'ei (exp!)
n-ary mekso operator: for an input of ordered list of ordered pairs ((X1, Y, it outputs formal generalized rational function (x - X1)^Y in the adjoined indeterminate (here: x).
cnanlagau
x1 is the generalized arithmetic-geometric mean of the elements of the 2-element set x2 (set; cardinality must be 2) of order x3 (either single extended-real number xor an unordered pair/2-element set of extended-real numbers).
cnanlime
x1 is the generalized weighted Lehmer mean of data x2 (completely specified ordered multiset/list of numbers) of Lehmer order x3 (either a single extended-real number xor an ordered pair of two extended-real numbers) with weights x4 (completely specified ordered multiset/list of numbers with the same cardinality as x2; defaults according to the Notes).
djeisone
x1 is an object described as x2, x3, ... (termset representing serializable tree structure compatible with JSON format of attribute-value pairs).
enfa
x1 abstractly pertains to an exponential/root/logarithmic relationship between the elements of x2 (ordered pair) which are related via concrete relationship x3.
funtiio
x1 (plural of ordered pairs) is an exhaustive set (possibly infinite) of inputs/outputs defining a unary function which yields result x3 when given input x2; x1(x2) = x3
grafnseljimcnkipliiu
x1 is a 'quipyew' tree graph with special node x2, on nodes x3 (set of points; includes x2), with edges x4 (set of ordered pairs of nodes), and with other properties x5.
jborefota
x1 is a pair of Lojbanists who frequently talk to each other in Lojban by telephone.
jventrajmaumce
x1 is an eventual extremal bound/asymptote (one sense)/limsup (limit superior/limit supremum)/liminf (limit inferior/limit infimum) of x2 (set, or ordered pair of a sequence or a function as the first term and the dummy variable (/input (slot)) thereof being considered as the (sometimes elidable) second term) in direction x3 (li) in ordered structure x4.
ki'irsi
x1 is a sequence in which each adjacent pair of elements is related by x2 (binary predicate; applied in the order of the sequence).
ku'aidzi
x1 is a pair of chopsticks for doing x2 (event)
orne
x1 is a pair (possibly ordered) of x2 and x3
pantalone
x1 is a pair of pantaloons
tcanaba
x1 (node/vertex/station) is forward of/along from x2 in oriented graph x3 (graph with orientation) using oriented edge path x4 (ordered sequence of ordered pairs). The path from x2 to x1 runs along/is coparallel with/downstream of the orientation on x3 along path x4.
tcanapu
x1 (node/vertex/station) is backward of/along from x2 in oriented graph x3 (graph with orientation) using oriented edge path x4 (ordered sequence of ordered pairs; oriented edges). The path from x2 to x1 along the (now-unoriented version of the) edges used in x4 is counter/against/upstream of the orientation of x3 (and/or given by the oriented version of x4).
toxsotiseira
x1 is arranged and to be traced/read in the manner of reading modern Latin script for English (from side to side along a line segment, then suddenly jumping back to the original side but on a nonintersecting coparallel line segment and proceeding in the same direction, with gross movement being perpendicular to each of these line segments and in a constant direction), starting at point x2, jumping at points x3 (ordered list of pairs, the first term of which is the end point of one line segment and the second term of which is the starting point of the immediately following line segment), and ending at point x4.
xorjina
x1 is a saddlebag/pair of saddlebags to use on animal/vehicle x2.
kuaidzi
x1 is a pair of chopsticks for doing x2 (event)

In notes:

va'icu'i (comp!)
discursive: in the same words.
ctenilteikeznulfau
f1 = r1 = x1 (event; perhaps: spacetime coordinates) is an equinox for season x2 at location/of or for celestial body/object d3 = x3 with respect to orbit/sun x4.
teirmijyfau
The elapsed time/duration between x1 (nu, or time-/date-stamp) and x2 (nu, or time-/date-stamp) is equal to the elapsed time/duration between x1 and x3 (nu, or time-/date-stamp), such that x2 occurred no later than x3 (thus, x1 is also a temporal midpoint between them), in frame of reference x4.
treicytunba
x1 is of the same rank/generation in hierarchical structure x2 by standard/partial ordering/relationships x3.
vlakamsmi
x1 is the similarity relation between all members of set x2 (set of quoted words) such that they all mean esentially one common thing x3 and are considered to be identical in any meaningful way in language x4.
vroca'o
c1=v1 is a French window/side-hinged window.
zucna
x1 is counterclockwise/left-turn-direction of[/to] x2 along/following track x3 [path] in frame of reference x4 (where the axis is within the region defined by the track as the boundary, as viewed from and defined by view(er) x4; see notes); x1 is locally to the left of x2, according to x4, constrained along x3; x1 is along a left turn from x2 along path x3, as viewed in frame x4.
boi'e'u
mekso operator/function terminator (in Polish notation): inserts exactly enough "{boi}"'s consecutively so as to terminate the most recently uttered operator/function in a mekso expression
di'ei'o'au (exp!)
mathematical ternary operator: Dirichlet convolution (a×b)(c)
fa'au (exp!)
mathematical unary operator: map notation
go'ei
repeat (copy-and-paste) the recontextualized content of the most-recent or indicated NOI relative clause.
ja'ai (exp!)
affirm last word: attached to cmavo to affirm them; denies negation by nai whenever it is applicable.
ju'au (exp!)
semi-mathematical binary operator: named number base operator/interpreter
ka'o'ai (exp!)
imaginary i (non-comma)
mau'au
mekso: conversion of operator/function to operand
tai'e'i (exp!)
mekso unary operator: basic Schlafli symbol composer (defined only on ordered lists)
tu'e'ei (exp!)
General-purpose left-bracket for arbitrary grouping of Lojban text; start highlight / selection marker.
tu'u'o (exp!)
General-purpose right-bracket for arbitrary grouping of Lojban text; end highlight / selection marker.
va'au'au (exp!)
Binary mekso operator: group-theoretic conjugation (group action): maps inputs (X1, X to X2^(-X= \phi(X. Default: X3 = 1.
zi'au
nonexistent/undefining it; the selbri is not applicable when the other terbri are filled in the manner in which they are in this utterance/bridi.
abvorci
x1 is a grandparent of x2 which/who has another grandparent x3 such that x1 is related to x2 by relationship x4, and x1 is related to x3 by relationship x5 which is NOT their mutual mating/intimate partnering, under cultural/personal paradigm x6; x1 and x3 are mutual co-grandparents.
abvroi
x1 is a grandparent of x2 which/who has another grandparent x3 such that x1 is related to x2 by relationship x4, and x1 is related to x3 by mating/intimate partnering relationship x5, under cultural/personal paradigm(s) x6; x1 and x3 are mutually partnered co-grandparents.
enxoiurodni
x1 is the (x2 + 1)-оюродный (li; integer) kin member/relative of x4 defined from base relation x3 (si'o; generic term, applied with respect to x4) in directed, connected tree graph/network/hierarchy x5.
feiksti
x1 does not exist/is not real/is not actual/is not reality/is fake for x2 under metaphysics x3; x1 is a fakester/huxter (no intention of tricking, because it does not exist).
grafetu
x1 is the graph on vertices/nodes x2 (set) and edges x3 (set of ordered or unordered tuples of vertices in x2) and with additional properties x4.
karbina
x1 and x2 are elements of the same partially-ordered set x3 (see notes) such that x1 and x2 cannot be meaningfully compared via said relation/in said property.
seplrcnite
x1 is a Dedekind cut associated with number/point x2 of totally ordered set x3
spaune
x1 (individual/entity/result) abruptly (re)spawns/appears/becomes/comes into being/existence/life by mechanism/under conditions x2; x2 spontaneously generates x1
tcaudu
x1 is the formatted address for something - (with format) starting with x2, which is an address/locality/administrative subunit/region which belongs to slightly broader address/locality/administrative subunit/region x3, which in turn itself belongs to a slightly broader address/locality/administrative subunit/region x4, \dots (etc.).
tseingu
x1 (node in a tree graph) and x2 (node in the same tree graph) have an essentially unique most recent (graph-nearest) common ancestor node A such that x3 [nonnegative integer; li] is the minimum element of the set consisting only of d(A, x1) and of d(A, x2), and such that x4 [integer; li] is d(A, x1) - d(A, x2), where d is the graph geodesic distance (defined to be infinite if nodes are not connected in the correct direction).
utka
x1 and x2 are path-linked by binary predicate x3 (ka) via intermediate steps x4 (ce'o; (ordered) list).