pa
noun
[ pɑː ]
• father.
• "Pa is busy on the telephone"
Origin:
early 19th century: abbreviation of papa.
Pa
abbreviation
• pascal(s).
Pa
symbol
• the chemical element protactinium.
PA
abbreviation
• Panama (international vehicle registration).
• Pennsylvania (in official postal use).
• personal assistant.
• Press Association.
• public address.
pascal
noun
• the SI unit of pressure, equal to one newton per square metre (approximately 0.000145 pounds per square inch, or 9.9 × 10−6 atmospheres).
Origin:
1950s: named after B. Pascal (see Pascal, Blaise).
protactinium
noun
• the chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium.
Origin:
early 20th century: from proto- ‘original, earlier’ + actinium, so named because one of its isotopes decays to form actinium.
