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(uncountable) A (usually self-sustaining) chemical reaction involving the bonding of oxygen with carbon or other fuel, with the production of heat and the presence of flame or smouldering.
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(countable) An instance of this chemical reaction, especially when intentionally created and maintained in a specific location to a useful end (such as a campfire or a hearth fire).
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(countable) The occurrence, often accidental, of fire in a certain place, causing damage and danger.
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(uncountable, alchemy, philosophy) The aforementioned chemical reaction of burning, considered one of the Classical elements or basic elements of alchemy.
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(countable, British) A heater or stove used in place of a real fire (such as an electric fire).
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(countable) The elements necessary to start a fire.
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(uncountable) The bullets or other projectiles fired from a gun or other ranged weapon.
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(countable) A planned bombardment by artillery or similar weapons, or the capability to deliver such.
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(countable, African-American Vernacular, slang) A firearm.
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(countable, figurative) A barrage, volley
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(astronautics) An instance of firing one or more rocket engines.
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Strength of passion, whether love or hate.
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Liveliness of imagination or fancy; intellectual and moral enthusiasm.
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Splendour; brilliancy; lustre; hence, a star.
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A severe trial; anything inflaming or provoking.
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Red coloration in a piece of opal.
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(gemology) The capacity of a gemstone, especially a faceted, cut gemstone, that is transparent to visible light, to disperse white light into its multispectral component parts, resulting in a flash of different colors, the richness and dispersion of which increases the gemstone's value.