Final answer:
The clarity of President Obama's word pronunciation can be described as strong articulation, which refers to the clear and distinct enunciation of syllables in speech.
Step-by-step explanation:
When discussing how clearly President Obama pronounces words, we are addressing his articulation, which is how clearly a person produces sounds. Clear articulation is essential in effectively delivering a message to an audience. Strong articulation means the speaker is pronouncing words so that each syllable can be heard distinctly, avoiding slurring and mumbling, which are more acceptable in casual situations but not in formal presentations or speeches.