Establish

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late Middle English (recorded earlier as stablish ): from Old French establiss-, lengthened stem of establir, from Latin stabilire ‘make firm’, from stabilis (adjective) ‘stable’.

wiktionary

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From Middle English establissen, from Old Frenchestabliss-, stem of some of the conjugated forms of establir, (Modern French établir), from Latin stabiliō, stabilīre, from stabilis(“firm, steady, stable”).

etymonline

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establish (v.)

late 14c., from Old French establiss-, present participle stem of establir "cause to stand still, establish, stipulate, set up, erect, build" (12c., Modern French établir), from Latin stabilire "make stable," from stabilis "stable" (see stable (adj.)). For the unetymological e-, see e-. Related: Established; establishing. An established church or religion is one sanctioned by the state.