steradian

/stəˈreɪdiən/

Meanings

noun

In the International System of Units, the derived unit of solid angle; the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere that has area r2. Symbol: sr

Examples :

"The lamp's reflector concentrates the light into a solid angle of approximately one steradian, providing focused illumination. "

Related Words

subtended verb

/sʌbˈtɛndɪd/ /səbˈtɛndɪd/

To use an angle to delimit (mark off, enclose) part of a straight or curved line, for example an arc or the opposite side of a triangle.

"The angle formed by looking at the top and bottom of the flagpole from where I stood subtended the entire height of the flagpole. "

approximately adverb

/əˈpɹɒk.sɪ.mət.li/ /əˈpɹɑk.sɪ.mət.li/

Imprecise but close to in quantity or amount.

"...approximately 60 beats per minute."

reflector noun

/ɹɪˈflɛktə(ɹ)/

Something which reflects heat, light or sound, especially something having a reflecting surface.

"The cyclist wore a bright yellow vest with a reflector on the back to be easily seen at night. "

providing verb

/pɹəˈvaɪdɪŋ/

To make a living; earn money for necessities.

"It is difficult to provide for my family working on minimum wage."

surface noun

/ˈsɜːfɪs/ /ˈsɝːfəs/

The overside or up-side of a flat object such as a table, or of a liquid.

"The smooth surface of the kitchen table was perfect for setting the dinner plates. "

concentrates noun

/ˈkɑnsənˌtɹeɪts/ /ˈkɑnsənˌtɹeɪts/

A substance that is in a condensed form.

"Many breakfast juices are made from concentrates, which are diluted with water before drinking. "

derived verb

/dɪˈɹaɪvd/

To obtain or receive (something) from something else.

"The student derived the answer to the math problem from the formula. "

system noun

/ˈsɪstəm/

A collection of organized things; a whole composed of relationships among its members.

"There are eight planets in the solar system."

illumination noun

/ɪˌluːməˈneɪʃən/ /ɪˌluːmɪˈneɪʃən/

The act of illuminating, or supplying with light; the state of being illuminated.

"The street's illumination helped me see clearly as I walked home at night. "

focused verb

/ˈfoʊkəst/ /ˈfoʊkəsd/

(followed by on or upon) To concentrate one's attention.

"I have to focus on my work."

international noun

/ˌɪntəˈnæʃ(ə)n(ə)l/ /ˌɪntɚˈnæʃ(ə)n(ə)l/

Someone who has represented their country in a particular sport.

"The United team includes five England internationals."

portion noun

/ˈpoəɹʃən/ /ˈpɔːʃən/ /ˈpɔɹʃən/

An allocated amount.

"The recipe called for a specific portion of flour, not the entire bag. "