srana -ra'a- gismu

x1 pertains to/is germane/relevant to/concerns/is related/associated with/is about x2.

Also: x1 is a question of/treats of x2; can be symmetric, although x1 is conventionally more specific or constrained in scope than x2. See also cmavo list ra'a, ckini, ponse, steci.

In definition:

ra'a
srana modal, 1st place pertained to by ... (generally more specific).
sera'a (comp!)
srana modal, 2nd place (pertaining to) relevantly; concerning ... (less specific).

In notes:

ckini
x1 is related to/associated with/akin to x2 by relationship x3.
cuntu
x1 is an affair/organized activity involving person(s) x2 (ind./mass); x1 is x2's business.
ponse
x1 possesses/owns/has x2 under law/custom x3; x1 is owner/proprietor of x2 under x3.
steci
x1 (ka) is specific/particular/specialized/[special]/a defining property of x2 among x3 (set).
banra'a
s1 pertains to language of s2=b2
cemra'a
s1 pertains to community s2=c2
gamseti'yra'a
x1 synaesthetizes qualia x2 with qualia x3 (but not necessarily the inverse) under conditions x4.
jdara'a
s1 pertains to religion of s2=l2
kamra'a
k1 is the relation of s1 to s2.
klura'a
s1 pertains to culture of s2=k2
nalra'a
x1 is irrelevant/unrelated to x2; x1 is arbitrary in relation to x2 [object of comparison; context or referent].
nunjo'e
n1 is an established connection between j1 and j2 at common locus j3.
prurai
x1 is/are the earliest, most ancient among x2
ra'arlogji
x1 is relevant logic / relevance logic, used to deduce/infer x2 (du'u)
ra'asku
x1 says x2 to x3 via medium x4, on topic / alluding to x5.
selgu'era'a
s1=sg1 pertains to country s2=sg2
suvyco'e
x1 is an abstraction involving x2
tutra'a
s1 pertains to territory of s2=t2
clenu
x1 is an axis/center curve/extended center (or, possibly metaphorically, focus 'point') of x2 in sense x3
modju
x1 (li; number) is congruent to x2 (li; number; see description for canonical/traditional/contextless default usage) modulo x3 (li; number); \frac(x1 - x is an integer.
fi'ai (exp!)
marks end of prenex in stack-based dialect
alkai
x1 is called after property x2 by x3
cti'omni
x1 is omnivore
sidmeme
x1 is a meme