Etymology
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Words related to cis-

*ko- 

Proto-Indo-European root, the stem of demonstrative pronoun meaning "this."

It forms all or part of: cis-; et cetera; harass; he; hence; her; here; him; his; hither; it.

It is the hypothetical source of/evidence for its existence is provided by:  Greek ekeinos "that person;" Latin cis "on this side," citra (adv.) "on this side;" Old Church Slavonic si, Lithuanian is, Hittite ki "this;" Old English hider, Gothic hidre "hither."

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trans- 

word-forming element meaning "across, beyond, through, on the other side of, to go beyond," from Latin trans (prep.) "across, over, beyond," perhaps originally present participle of a verb *trare-, meaning "to cross," from PIE *tra-, variant of root *tere- (2) "cross over, pass through, overcome." In chemical use indicating "a compound in which two characteristic groups are situated on opposite sides of an axis of a molecule" [Flood].

ultra- 

word-forming element meaning "beyond" (ultraviolet) or "extremely" (ultramodern), from Latin ultra- from ultra (adv. and prep.) "beyond, on the other side, on the farther side, past, over, across," from PIE *ol-tero-, suffixed form of root *al- "beyond." In common use from early 19c., it appears to have arisen from French political designations. As its own word, a noun meaning "extremist" of various stripes, it is first recorded 1817, from French ultra, shortening of ultra-royaliste "extreme royalist."

cisalpine (adj.)

"south of the Alps," 1540s, from Latin cisalpinus "on this side of the Alps" (from the Roman point of view), from cis- "on this side" (see cis-) + Alpinus "Alpine" (see Alpine). Compare ultramontane.

cisgender (adj.)

also cis-gender, "not transgender," in general use by 2011, in the jargon of psychological journals from 1990s, from cis- "on this side of" + gender.

cismontane (adj.)

"situated on (the speaker's) side of the mountain or mountains," 1826, from Latin cis- "on this side of" (see cis-) + stem of mons "mountain" (from PIE root *men- (2) "to project"). Specifically "on the north side of the Alps" (compare ultramontane).