Dictionary.com
Thesaurus.com

Dictionary.com
Thesaurus.com

definitions

Search

synonyms

Orbiting Astronomical Observatory

noun

OAO.

Explore Dictionary.com

Weather Words You Need to Know
Can You Translate These Famous Phrases From Emoji?
These Are the Longest Words in English
These Are the Saddest Phrases in English

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Others Are Reading

It's OK to Use They to Describe One Person: Here's Why
Avoid these words. Seriously.

Word of the Day

Words We Get Wrong: How Many of These Can You Say?

Did You Know Real People Write the Dictionary?

Browse the Dictionary:

#
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z

Browse by Category:

Slang
Emoji
Acronyms
Pop Culture
More

About
|
Cookies, Terms, & Privacy

© 2018 Dictionary.com, LLC