Englishfor English speakers
former
Adjective
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A former mathx/math (e.g., president, country, wife) used to be the mathx/math but is not anymore.
Former president Clinton was giving a speech at the school.
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The former is the first of two things that have already been talked about.
I've taught in high school and university. The former (i.e., high school) is more exciting, but university is less stressful.
obligation
Noun
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An obligation is a duty, something you must do.