pa

noun

1. an informal term for a father; probably derived from baby talk

Similar word(s): dad, dada, daddy, papa, pop

Definition categories: person, begetter, father

2. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

Similar word(s): protactinium

Definition categories: substance, metal

3. a unit of pressure equal to one newton per square meter

Similar word(s): pascal

Definition categories: quantity

4. a Mid-Atlantic state; one of the original 13 colonies

Similar word(s): pennsylvania

Definition categories: location

5. an electronic amplification system used as a communication system in public areas

Definition categories: man–made