On gloss:

ybu
letteral for y.

On grammatical class:

y
hesitation noise; maintains the floor while speaker decides what to say next.
ie'o
filler word: um, like, y'know
yyy
Equivalent to ".{y}" but connotes a somewhat longer pause

In definition:

enai
logical connective: sumti afterthought x but not y.
gi'enai
logical connective: bridi-tail afterthought x but not y.
ijenai
logical connective: sentence afterthought x but not y.
jenai
logical connective: tanru-internal afterthought x but not y.
zbiselcigla
x1 is a quantity of snot/booger(y material) secreted by the nose of body x2, of composition x3
iy'y
letteral for y
ra'i'e
ternary mekso/mathematical operator: radical; for input (x,y,z), it outputs the largest y-th-power-free product of prime divisors of x in structure (ring) z.
cmavrdepsna
x1 is the selma'o "Y".
jinmrtitri
x1 is a quantity of/contains/is made of yttrium (Y).
namcixu
For mo'e x4 x in x1 there exist mo'e x5 y in x2 such that x me'au x3 y; for mo'e x6 y in x2 there exist mo'e x7 x in x1 such that x me'au x3 y.
rolsixu
For every x in x1, there exists a y in x2 such that x me'au x3 y; For every y in x2 there exists an x in x1 such that x me'au x3 y.

In notes:

bazysa'u
x1 is a necessary and sufficient condition for x2 to happen
brarafsi
x1 ("ra'oi"-quote) is a long (unreduced) rafsi/combining form of word/concept x2 in language x3.
brivla
v1 is a morphologically defined predicate word signifying relation b2 in language v3.
depsna
s1 is a hesitation sound produced by s2=d1 while for/until d2 at state d3 before starting/continuing d4 (activity/process).
ficystodraunju
x1 is an injective function (distinctness-preserving function) from x2 (domain) to x3 (codomain).
ki'irgrafu
x1 is a relation space formed from elements/nodes in set x2 and relationship x3 which connects them.
mitysisku
x1 seeks/searches/looks for something that has the same identity as x2 among x3
patyta'a
p1=t1 complains verbally to p3=t2 about p2=t3 in language t4
terbri
x1 (sequence of sumti) is the sequence of arguments that, joined by relation x2 (ka), form predicate x3 (du'u)
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.
zevlyjvo
x1 is a zi'evla-based lujvo meaning x2, with arguments x3 from tanru/compound-phrase x4
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).
gicmu
x1 is a (Lojban) root word expressing relation x2 among argument roles x3, with affix(es) x4.
kinfi
x1 is a binary relationship which is symmetric (under exchange of arguments/terms) in space/under conditions/on set x2.
kinra
x1 is a binary relationship which is reflexive in space/under conditions/on set x2.
socni
x1 is a binary operator which is associative in space/under conditions/on (or endowing) set x2.
takni
x1 is a binary relationship which is transitive in space/under conditions/on set x2.
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.
ma'au
Binary mekso operator: uniform probability A(X2)u(X for input (X1,X where X1 is a number and X2 is a set or space. (See notes for details).
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)
te'au'u
mekso ternary operator: Knuth up-arrow notation: a \uparrow \dots \uparrow b of order/with c-2 arrows ("\uparrow") initially, evaluated from right to left; the cth hyperoperator on a by b.
te'i'ai
6-ary mekso/mathematical operator: Heaviside function/step/Theta function of a, of order b, in structure c, using distribution d, within approximated limit e, with value f_b at 0
xy'y
naturalistic interjection: in thought/contemplation
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
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.
ki'inmoi
x1 is in relation x4 with x2 to the x3th degree; x1 is x3 nodes before x2 in the sequence such that every element thereof and the next element are linked by the relation x4; x1 is [ that which is in relation x4 with ] (repeat x3 times the part between brackets) x2
seplrcnite
x1 is a Dedekind cut associated with number/point x2 of totally ordered set x3
tirkece
x1 reflects Turkish/[Turkic] culture/nationality/language in aspect x2.
uinda
x1 is a part of Lojban text representing rule 'indicator' according to the first edition of the book 'The Complete Lojban Language'.
valrxazdomru
x1 is a xazdmru word
agvaskaldjentes
Aguascalientes
sakatekas
Zacatecas
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.