linji -lij-li'i- gismu

x1 is a line/among lines [1-dimensional shape/form] defined by set of points x2.

Ray/vector (farli'i or porli'i). See also kruvi, sirji, jganu, kantu, mokca.

In notes:

jganu
x1 is an angle [2-dimensional shape/form] from vertex x2 subtended by lateral [segment] x3.
kantu
x1 is a quantum/ray/elementary particle/smallest measurable increment of property/activity x2.
kruvi
x1 is a curve/turn/bend in x2, at locus x3, and defined by set of points/properties x4.
mokca
x1 is a point/instant/moment [0-dimensional shape/form] in/on/at time/place x2.
sirji
x1 is straight/direct/line segment/interval between x2 and x3; (adjective:) x1 is linear.
jedjipli'i
l1 is a meridian on celestial body/sphere j2 (default Earth)
vlali'i
l1 is a line of text defined by set of words/string l2 meaning x3=v2 in language x4=v3.