In just two decades, aids has become one of the most serious public health problems in the united states and worldwide is True.
Ten years make up one decade. The word is derived from the Ancient Greek word, romanized as dekas, which denotes a group of ten, via French and Latin. Decades can refer to specific collections of calendar years or any ten-year period, such as those in a person's life.
A "decade" is any term of ten years. For instance, the phrase "during his last decade, Mozart explored chromatic harmony to a degree rare at the time" simply refers to Wolfgang Amadeus Mozart's final ten years of life, regardless of the calendar years that are included.
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