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)
mumvlabivli'i
x1 is wuyan lüshi with tone pattern x2, rhyming at locus x3.
mumvlavonli'i
x1 is wuyan jueju with tone pattern x2, rhyming at locus x3.
vlali'i
l1 is a line of text defined by set of words/string l2 meaning x3=v2 in language x4=v3.
zelvlabivli'i
x1 is qiyan lüshi with tone pattern x2, rhyming at locus x3.
zelvlavonli'i
x1 is qiyan jueju with tone pattern x2, rhyming at locus x3.
strelka
x1 is an arrow symbol