1. Having four equal sides and four right angles or forming a right angle
2. Characterized by honesty and fairness; SYN. straight.
3. Without evasion or compromise; SYN. straightforward.
4. (Informal) Leaving no balance
5. (Slang) Rigidly conventional or old-fashioned; SYN. straight.
Marked by good order and cleanliness in appearance or habits