SKIP TO CONTENT

PO

Definitions of PO
  1. noun
    an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States
    synonyms: Post Office, US Post Office, United States Post Office
    see moresee less
    type of:
    independent agency
    an agency of the United States government that is created by an act of Congress and is independent of the executive departments
  2. noun
    a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
    synonyms: P.O., petty officer
    see moresee less
    types:
    master-at-arms
    the senior petty officer; responsible for discipline aboard ship
    SCPO, senior chief petty officer
    a senior noncommissioned officer in the Navy or Coast Guard with a rank comparable to master sergeant in the Army
    type of:
    enlisted officer, noncom, noncommissioned officer
    a military officer appointed from enlisted personnel
Word Family
EDITOR’S CHOICE

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.

SAT/PSAT

$29.95
  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week

TOEFL

$29.95
  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week

ACT

$29.95
  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week