To determine the number of syllables in ordinateur (computer), divide the word at each distinct vowel sound:
or - first syllable
di - second syllable
na - third syllable
teur - fourth syllable
The word ordinateur therefore has 4 syllables: or-di-na-teur.
Each syllable contains exactly one vowel sound: /o/ in or, /i/ in di, /a/ in na, and /œ/ in teur. The eu in the final syllable represents a single vowel sound /œ/, not two separate sounds, so teur is one syllable.