1. "Tree": This is the most common meaning. It refers to any kind of tree in general.
2. "Thorn": This meaning is less common but is still used in some contexts. It specifically refers to the thorny bushes that are common in the Kikuyu region.
Examples:
* Igiri iria - "A tall tree"
* Igiri iria iria - "Many trees"
* Igiri iria ingi - "A big tree"
* Igiri iria nene - "A thick tree"
* Igiri iria nene - "A thorny bush"
It's important to consider the context in which the word is used to determine the correct meaning.