- A recreational aircraft that is constructed of lightweight materials such as aluminum, graphite compositions, or high-strength plastics, having an engine of 15 to 40 horsepower and resembling a motorized hang glider with wings.超轻型飞机：由轻型材料如铝、石墨合成物或高强度塑料等制成的消遣用的飞机，有一个15到40马力的发动机，是带动力的悬挂式滑翔机和机翼的组合
- Aristotelians
- Aristotelic
- Aristotle
- arithmetic
- arithmetical
- arithmetic average
- arithmetic mean
- arithmetic progression
- arithmetics
- arithmetic sequence
- -arium
- -ariums
- Arius
- Arizona
- Arizona College of the Bible
- Arizona College of the Bible
- Arizona State University
- Arizona Western College
- Arjuna
- ark
- Arkansas
- Arkansas Baptist College
- Arkansas Baptist College
- Arkansas College
- Arkansas River