On gloss:

my
letteral for m.

In definition:

caldectre
c1=d1=m1 (space/volume/region/room) is d2=m2 cubic decimetres/decimeters (m3) measured in perpendicular directions (triple)/defined by set of points (set)/occupied by c2=m3 by standard m4.
caltre
c1=m1 (space/volume/region/room) is m2 cubic metres/meters (m3) measured in perpendicular directions (triple)/defined by set of points (set)/occupied by c2=m3 by standard m4.
pitytre
p1=m1 is m2 square metres/meters (m2) measured in perpendicular directions (set)/defined by set of points (set) p2=m3 by standard m4.
fa'ai'ai
mekso k-ary operator, for natural k and 1 < k < 5: ordered input (f, g, S, m) where f and g are functions, S is a set of positive integers or "ro" (="all"), and m is 0 or 1 (as a toggle); output is a function equivalent to the function f as applied to an input ordered tuple with g applied to the entries/terms with indices in S (or to all entries/terms if S="ro") if m=0, or g left-composed with the same if m=1.
ji'i'u
mekso, at-most-5-ary operator: a rounding function; ordered input list is (x,n,t,m,b) and the output is sgn(x) bt roundn (b(-t) abs(x)), with rounding preference n and where the fractional part of b(-t) abs(x) being equal to 1/2 causes the roundn ( ) function to map b(-t) abs(x) to the nearest integer of form 2Z+m, for base b (determined by context if not explicitly input) and some integer Z (determined by context).
mai'e'e (exp!)
digit/number: Meissel-Mertens constant M ≈ 0.2614972128476427837554268386086958590516…
carnamajga
x1 (li; tensor with units of kg×m2) is the moment of inertia/angular inertial-mass/rotational inertia of object x2 around axis/point of reference x3 in basis/coordinate system x4.
gravnutnoia
x1 is Newton's constant of universal gravitation/G/big G [approximately equal to: 6.67×10(−11) N·(m/kg)2 ] expressed in units x2 (default: unitless/dimensionless and equal to 1) in paradigm/system/metaphysics/universe x3 (default: this, our actual, physical universe)
stefanboltsemasi
x1 is the black-body Stefan-Boltzmann sigmaSB constant [approximately equal to: 5.670373(21)×10(−8) W/(m2×K4)], expressed in units x2 (default: unitless/dimensionless and equal to pi2 / 480) in paradigm/system/metaphysics/universe x3 (default: this, our actual, physical universe)

In notes:

ci'ima'u (comp!)
number: uncountably infinite of some sort or infinite in the sense of satisfying the Generalized Continuum Hypothesis.
eiksyspespe
x1 is a spouse of x2's former spouse by law/custom/standard x3.
fancysuksa
function f1 is discontinuous/abrupt/sharply changes locally (in output) on/at s2 (set), with abruptness of type x3 (default: 1)
zilcu'i
x1 (predication) is possible.
cajni
x1 is a binary operator which is commutative in space/under conditions/on (or endowing) set x2; x1 and x2 are each abelian (in different senses).
facni
x1 is an n-ary operator/map which is distributive/linear/homomorphic in or over or from space/structure x2, mapping to space or structure x3, thereby producing a new space/structure x4 which is the 'union' of x2 and x3 endowed with x1; x1 distributes over/through all of the operators of x2.
kinra
x1 is a binary relationship which is reflexive in space/under conditions/on set x2.
be'ei'oi
ternary mekso operator: x1th Bergelson multiplicative interval with exponents bounded from above by function x2 and with sequence of shifts x3, where exponents belong to set x4
bi'oi'au (exp!)
digit/number: interval/range indicator for significant digits (determined by lesser endpoint).
ca'o'e
mekso 4-nary operator: spherical harmonics on colatitudinal/polar angle a and azimuthal/longitudinal angle b of unassociated order c and associated order d.
di'ei'o'au
mathematical ternary operator: Dirichlet convolution (a×b)(c)
fau'e
iterated function left-composition with self: f∘f∘...∘f, n times.
me'ei'o
mekso n-ary operator: interleave sequences
mi'i'au (exp!)
digit/number: interval/range indicator for significant digits (determined by midpoint).
pau'au (exp!)
ternary mekso operator: p-adic valuation; outputs (positive) infinity if x1 = 0 and, else, outputs sup(Set(k: k is a nonnegative integer, and ((1 - x3)x divides x1)), where pn is the nth prime (such that p1 = 2).
pi'ai (exp!)
Prefix multiplication of unit selbri
rai'i
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)
se'ai'e
(n, 1, 2, \dots, n-2, n - 1)st conversion.
se'au'e
(2, 3, \dots, n-1, n, 1)st conversion.
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
ve'oi
Close all open mathematical brackets.
daigno
x1 (ordered list) is a sampling of entries of matrix/tensor x2 in which exactly one entry is sampled from each row and/or column (etc.) between entries x3 (list; default: the largest 'square'/'hypercubic' sampling possible in the entire tensor starting with the first entry, see notes) inclusively following selection procedure/rule/function/order x4 (default: diagonally, see notes), where the tensor/matrix is expressed in basis/under conditions x5
flaukse
x1 is the vector flux (flow) of quantity/substance (count) x2 through (geometric/imaginary) hypersurface/embedded manifold x3 per unit hyperarea per unit time.
gradrgu
x1 measures to be equal to x2 (li; default: 1) g of acceleration according to standard x3 (default is as in notes).
plankexu
x1 is the elementary unit (quantum) of angular momentum/half of Planck's reduced constant [id est: hbar/2 = h/(4 pi)] expressed in units x2 (default: unitless/dimensionless and so that it is equal to 1) in paradigm/system/metaphysics/universe x3 (default: this, our actual, physical universe)
sparmedika
s1 is a medick/burclover (genus Medicago) of species/strain/cultivar s2 (default: Medicago sativa)
tcelerita
x1 (number; default: 1) is the physical speed supremum (for objects of positive masses)/celeritas/c0 expressed in units x2 (default: in terms of natural parameter c0; id est: unitless/dimensionless and equal to 1) in (paradigm/system of) physics x3 (default: this, our actual. physical universe and reality);
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).
xunmusu
x1 is hummus, a Levantine Arab dip made of chickpeas and tahini
cia'o'e
mekso 4-nary operator: spherical harmonics on colatitudinal/polar angle a and azimuthal/longitudinal angle b of unassociated order c and associated order d.