Pronunciation

How to pronounce “additional

“additional” is pronounced /ɐdɪʃənəl/ — 4 syllables.
The sound

Say “additional

additional

/ɐdɪʃənəl/

Say it right

4 syllables. Stress the 'dit' part (say it longer and louder) and let the others relax — unstressed vowels often soften to a lazy /ə/.
Meaning

further or added

called for additional troops

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