Roughly
Part of speech: adverb
Definition: In a rough manner. Unevenly; harshly; rudely; severely; austerely. Imprecise but close to in quantity or amount; approximately.
Example sentence: One of the simplest ways to get an idea of one trillion dollars is to consider the amount in terms of the passage of time. One million seconds is equal to roughly eleven days and twelve hours, and one billion seconds is thirty-two years. One trillion seconds equals thirty-two thousand years.
Approximately
Part of speech: adverb
Definition: imprecise but close to in quantity or amount