source

Everyday

1. A source is where something comes from, like the source of a river or a source of light. tree →
2. A source is a book, website or person where you get information. tree →
3. To source means to find where to get something from. tree →

In the lessons

In science, the Sun is our main source of light and heat; a battery is a power source; food is a source of energy and vitamins (oranges are a source of vitamin C). In geography, the source of a river is where it starts, often in hills or a spring; the mouth is where it ends. In history and research, children check sources to see if information is true; primary sources come from the time itself. Phrases: source of, light source, energy source, reliable source, primary source.

Examples

• The Sun is a source of light. tree →
• Find the source of the river on the map. tree →
• Milk is a good source of calcium. tree →
• Check your sources before you believe something online. tree →
• The diary is a primary source from the war. tree →
• A torch is a light source. tree →
• Where did you find that information? What's your source? tree →
• Wind and sun are clean sources of energy. tree →

Note

Countable: a source, sources. Do not confuse with «sauce» (for food), which sounds almost the same in British English. Source (where it starts) vs mouth (where a river ends). A reliable source is one you can trust.

In Jewish tradition

In science, the Sun is our main source of light and heat; a battery is a power source; food is a source of energy and vitamins (oranges are a source of vitamin C). In geography, the source of a river is where it starts, often in hills or a spring; the mouth is where it ends. In history and research, children check sources to see if information is true; primary sources come from the time itself. Phrases: source of, light source, energy source, reliable source, primary source.

Examples

• Source: Internet Sacred Text Archive, https://archive.sacred-texts.com/jud/yetzirah.htm . (Sefer Yetzirah, Westcott 1887) tree →
• Source: https://www.sefaria.org/api/v3/texts/Sefer%20Yetzirah%20Gra%20Version?version=english%7CSefer+Yezirah%2C+trans.+by+Isidor+Kalisch.+New+York%2C+1877 Sefaria versionTitle: Sefer Yezirah, trans. by Isidor Kalisch. (Sefer Yetzirah, Kalisch 1877) tree →
• Source: https://en.wikisource.org/wiki/SepherYetzirah (/Preface, /Introduction, /SepherYetzirah), fetched via index.php?action=render on 2026-10-17. (Sefer Yetzirah, Westcott 1893) tree →

Note

Countable: a source, sources. Do not confuse with «sauce» (for food), which sounds almost the same in British English. Source (where it starts) vs mouth (where a river ends). A reliable source is one you can trust.