The Britannica Dictionary
mobile search
Home
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
×
Britannica Homepage
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
The Britannica Dictionary
cosine
1 ENTRIES FOUND:
cosine
(noun)
cosine
/
ˈ
koʊˌsaɪn/
noun
plural
cosines
cosine
/
ˈ
koʊˌsaɪn/
noun
plural
cosines
Britannica Dictionary definition of COSINE
[
count
]
geometry
:
the ratio between the long side (called the hypotenuse) and the side that is next to an acute angle in a right triangle
ASK THE EDITOR
What does the phrase "for the rest of the day" mean?
See the answer »
QUIZZES
Vocabulary Quiz
Test your word power
Take the Quiz »
Name That Thing
Take our visual quiz
Test Your Knowledge »
WORD OF THE DAY
potluck
:
a meal to which everyone who is invited brings food to share (
US
)
Learn More »