manri -mar- gismu

x1 is a frame of reference/standard for observing/measuring/determining x2, with/by rules x3.

(x1 may be object or si'o idea); See also cmavo list ma'i, ckilu, merli, pajni, cimde, jdice, marde.

In definition:

ma'i
manri modal, 1st place (by standard 2) in reference frame ...
sema'i (comp!)
manri modal, 2nd place (of reference) as a reference standard for observing ...
tema'i (comp!)
manri modal, 3rd place (of reference) observed/measured with/by rules ...

In notes:

cimde
x1 (property - ka) is a dimension of space/object x2 according to rules/model x3.
ckilu
x1 (si'o) is a scale of units for measuring/observing/determining x2 (state).
jdice
x1 (person) decides/makes decision x2 (du'u) about matter x3 (event/state).
marde
x1 are the ethics/morals/moral standards/ethical standards of x2 (ind./mass) about situation x3.
merli
x1 (agent) measures/evaluates x2 [quantity] as x3 units on scale x4 (si'o), with accuracy x5.
pajni
x1 judges/referees/arbitrates/is a judge determining/deciding matter x2 (abstract).
mardikca
d1 is positive electric charge in d2.
markai
x1 qualifies as / counts as being x2 (ka) by standard x3
mibmanri
x1 is a first-person perspective (frame of reference), observing x2, with rules x3
selmarde
x1 (ind./mass) has the ethics/morals/moral x2 about situation x3.
clenu
x1 is an axis/center curve/extended center (or, possibly metaphorically, focus 'point') of x2 in sense x3