| robalo | (noun) a kind of percoid fish | - |
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| robber | (noun) a thief who steals from someone by threatening violence | - |
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| robbery | (noun) larceny by threat of violence | - |
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| (noun) plundering during riots or in wartime | Synonyms: looting |
| robe | (noun) any loose flowing garment | - |
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| (noun) outerwear consisting of a long flowing garment used for official or ceremonial occasions | Synonyms: gown |
| robin | (noun) large American thrush having a rust-red breast and abdomen | Synonyms: American robin, Turdus migratorius |
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| (noun) small Old World songbird with a reddish breast | Synonyms: Erithacus rubecola, Old World robin, redbreast, robin redbreast |
| roble | (noun) tall graceful deciduous California oak having leathery leaves and slender pointed acorns | Synonyms: California white oak, Quercus lobata, valley oak, valley white oak |
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| (noun) large tree of Trinidad and Guyana having odd-pinnate leaves and violet-scented axillary racemes of yellow flowers and long smooth pods; grown as a specimen in parks and large gardens | Synonyms: Platymiscium trinitatis |
| robocall | (noun) An phone call made by an automated service | - |
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| robot | (noun) a mechanism that can move automatically | Synonyms: automaton, golem |
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| robotics | (noun) the area of AI concerned with the practical use of robots | - |
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| robustness | (noun) the property of being strong and healthy in constitution | Synonyms: hardiness, lustiness |
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| (noun) the characteristic of being strong enough to withstand intellectual challenge | - |