midju -mij- gismu

x1 is in/at the middle/center/midpoint/[is a focus] of x2; (adjective:) x1 is central.

See also lanxe, jbini, nutli, snuji, milxe, denmi, ralju.

In notes:

centero
x1 is in the center of x2
ctemidju
m1 is the midnight of n2 at location n3.
denmi
x1 is dense/concentrated/packed/intense in property x2 (ka) at location/locus x3.
dormidju
m1 is the noon (midday) of day d2 at location d3.
dormijbalvi
b1 is later than noon of day d2 at location d3.
jbini
x1 is between/among set of points/bounds/limits x2 (set)/amidst mass x2 in property x3 (ka).
kernelo
x1 is a kernel/nucleus/'nut' of x2; x1 is central
lanxe
x1 is in balance/equilibrium under forces x2 (mass).
ma'ai (exp!)
mansa modal, 1st place (satisfying evaluator) satisfied by …
mijdi'esirji
x1 is a radius of shape x2
mijycritu
m1 is the middle of fall/autumn [harvest/cooling season] of year c2 at location c3
milxe
x1 is mild/non-extreme/gentle/middling/somewhat in property x2 (ka); x1 is not very x2.
narge
x1 is a nut [body-part: hard-shelled fruit] from plant/species x2 with shell x3 and kernel x4.
nutli
x1 is neutral/not taking sides/medial/not towards any extreme on scale/in dissension x2.
plinymidju
x1 is the planetary core of x2
ralju
x1 is principal/chief/leader/main/[staple], most significant among x2 (set) in property x3 (ka).
ratmidju
x1=m1 is the nucleus of atom x2=m2=r1.
sema'ai (comp!)
mansa modal, 2nd place (satisfying evaluator) such that …
slakymidju
m1 (sance) is (in)/occupies the nucleus of syllable s1=m2.
snuji
x1 is a sandwich/layering [not restricted to food] of x2 sandwiched between x3.
stagrcinara
s1 is the edible portion s2 [default: head] of artichoke s3.
tema'ai (comp!)
mansa modal, 3rd place (satisfying evaluator) satisfying in property …