3 syllables:
easy in, friesian

4 syllables:
belizian

5 syllables:
manganesian, megalesian

2 syllables:
fission, grison, lycian, frisson, listen, titian, stiffen, griffon, driven, risen, mizzen, whitsun, prison, christen, glisten, tisane, mission, writhen, sivan, given, gryphon

3 syllables:
position, admission, tahitian, vendition, tradition, ignition, sedition, perdition, monition, magician, fruition, ambition, forgiven, emission, tuition, technician, contrition, condition, arisen, transition, addition, mortician, edition, optician, rendition, remission, volition, clinician, audition, transmission, patrician, cognition, submission, physician, sortition, logician, petition, abscission, partition, omission, commission, attrition, musician, nutrition, munition, suspicion, galician, imprison, detrition, tactician, permission, fijian, median

4 syllables:
saurischian, deglutition, in condition, dietitian, inhibition, apposition, ammunition, imposition, ornithischian, composition, malnutrition, imbibition, coalition, field emission, phase transition, exhibition, premonition, intromission, parturition, intermission, esthetician, repetition, micturition, acquisition, house physician, erudition, cosmetician, postposition, ordovician, prohibition, trade edition, politician, brussels griffon, demolition, definition, obstetrician, rhetorician, dietician, competition, preterition, readmission, reposition, manumission, admonition, extradition, preposition, superstition, inanition, inquisition, recondition, electrician, aesthetician, requisition, expedition, disquisition, deposition, proposition, transposition, recognition, precondition, apparition, supposition, statistician, precognition, malposition, phonetician, streptolysin, abolition, exposition, opposition, disposition, intuition, armenian, athenian, bohemian, carelian, carnelian, chameleon, comedian, cornelian, karelian, maldivian, parhelion, prosimian, sardinian, slovenian

5 syllables:
juxtaposition, mathematician, dialectician, photoemission, lotus position, geriatrician, decomposition, predisposition, indisposition, dental technician, academician, presupposition, pediatrician, semiotician, paediatrician, geometrician, redefinition, interposition, theoretician, arithmetician, nuclear fission, perihelion

6 syllables:
boundary condition, econometrician, limited edition, resident physician, writ of prohibition, aristotelean, aristotelian, mephistophelian, standup comedian

7 syllables:
double decomposition, automatic transmission, missionary position, electrodeposition, secondary emission

8 syllables:
reciprocal inhibition

9 syllables:
atomic energy commission