(Latin: air, wind)
2. An apparatus that allows fuel and air into the cylinder of an internal combustion engine, or one that makes it possible for combustion gases to exit.
3. In anatomy, one or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or retard the flow in the opposite direction; such as, the ileocolic (small intestine and large intestine valve), mitral (heart valve), and semilunar (valves at the beginning of the artery of the heart).
2. To provide an enclosed space with a vent or other means of letting fresh air in and stale air out.
3. To expose something to moving fresh air in order to dry, cool, or preserve it.
4. To oxygenate, or to aerate, the blood through the blood vessels of the lungs.
Etymology: "to blow away something" (as in the wind); from Latin ventilatus, past participle of ventilare, "to brandish, to toss in the air, to winnow, to fan, to agitate, to set in motion"; from ventulus, "a breeze" a diminutive of ventus, "wind".
2. A mechanical system in a building that provides fresh air.
3. The bodily process of inhalation and exhalation which includes the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation.
4. The replacement of stale or noxious air with fresh air.
Ventilation is a process of moving or circulating air, so as to supply outside air to an enclosed space and/or to remove stale air from the area, with the purpose of cooling, purification, moisture reduction, etc.; which may or may not involve mechanical conditioning.
2. A device that circulates fresh air in an enclosed space.
3. A device used for ventilation; that is, to produce an air flow or circulate air currents; such as, a fan or a blower.
2. To examine something in order to remove the bad, unusable, or undesirable parts.
3. To examine closely in order to separate the good from the bad; to sift.
4. To remove (people or things that are less important, desirable, etc.) from a larger group or list: "The least qualified applicants were winnowed out of the initial pool."
5. To make (a list of possible choices) smaller by removing the less desirable choices: "The list of candidates has been winnowed; that is, narrowed down or whittled down to seven."
This sense of winnow is often followed by "down": "He needs to winnow down his options."6. Etymology: Old English windwian, from wind, "air in motion, paring down". Cognate with Old Norse vinza, Old High German winton, "to fan, to winnow"; "to throw (grain) apart"; from Latin vannus, "winnowing fan".
The same concept describes Latin ventilare, "winnow", the source of ventilate in English which came from ventus, "wind".