Cold
Cold is the presence of low temperature, especially in the atmosphere. In common usage, cold is often a subjective perception. A lower bound to temperature is absolute zero, defined as 0.00 K on the Kelvin scale, an absolute thermodynamic temperature scale. This corresponds to −273.15 °C on the Celsius scale, −459.67 °F on the Fahrenheit scale, and 0.00 °R on the Rankine scale.
Since temperature relates to the thermal energy held by an object or a sample of matter, which is the kinetic energy of the random motion of the particle constituents of matter, an object will have less thermal energy when it is colder and more when it is hotter. If it were possible to cool a system to absolute zero, all motion of the particles in a sample of matter would cease and they would be at complete rest in this classical sense. The object would be described as having zero thermal energy. Microscopically in the description of quantum mechanics, however, matter still has zero-point energy even at absolute zero, because of the uncertainty principle.
Cool (adjective)
Having a slightly low temperature; mildly or pleasantly cold.
Cool (adjective)
Allowing or suggesting heat relief.
“a cool grey colour”
Cool (adjective)
Of a person, not showing emotion; calm and in control of oneself.
Cool (adjective)
Unenthusiastic, lukewarm, skeptical.
“His proposals had a cool reception.”
Cool (adjective)
Calmly audacious.
“In control as always, he came up with a cool plan.”
Cool (adjective)
Applied facetiously to a sum of money, commonly as if to give emphasis to the largeness of the amount.
Cool (adjective)
Of a person, knowing what to do and how to behave; considered popular by others.
Cool (adjective)
In fashion, part of or fitting the in crowd; originally hipster slang.
Cool (adjective)
Of an action, all right; acceptable; that does not present a problem.
“Is it cool if I sleep here tonight?”
Cool (adjective)
Of a person, not upset by circumstances that might ordinarily be upsetting.
“I’m completely cool with my girlfriend leaving me.”
Cool (noun)
A moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness.
“in the cool of the morning”
Cool (noun)
A calm temperament.
“calmness|composure”
Cool (noun)
The property of being cool, popular or in fashion.
Cool (verb)
To lose heat, to get colder.
“I like to let my tea cool before drinking it so I don’t burn my tongue.”
Cool (verb)
To make cooler, less warm.
Cool (verb)
To become less intense, e.g. less amicable or passionate.
“Relations cooled between the USA and the USSR after 1980.”
Cool (verb)
To make less intense, e.g. less amicable or passionate.
Cool (verb)
To kill.
Cold (adjective)
Having a low temperature.
“A cold wind whistled through the trees.”
Cold (adjective)
Causing the air to be cold.
“The forecast is that it will be very cold today.”
Cold (adjective)
Feeling the sensation of coldness, especially to the point of discomfort.
“She was so cold she was shivering.”
Cold (adjective)
Unfriendly, emotionally distant or unfeeling.
“She shot me a cold glance before turning her back.”
Cold (adjective)
Dispassionate, not prejudiced or partisan, impartial.
“Let’s look at this tomorrow with a cold head.”
“He’s a nice guy, but the cold facts say we should fire him.”
“The cold truth is that states rarely undertake military action unless their national interests are at stake.”
Cold (adjective)
Completely unprepared; without introduction.
“He was assigned cold calls for the first three months.”
Cold (adjective)
Unconscious or deeply asleep; deprived of the metaphorical heat associated with life or consciousness.
“I knocked him out cold.”
“After one more beer he passed out cold.”
Cold (adjective)
Perfectly, exactly, completely; by heart.
“Practice your music scales until you know them cold.”
“Try both these maneuvers until you have them cold and can do them in the dark without thinking.”
“Rehearse your lines until you have them down cold.”
“Keep that list in front of you, or memorize it cold.”
Cold (adjective)
Cornered, done for.
“With that receipt, we have them cold for fraud.”
“Criminal interrogation. Initially they will dream up explanations faster than you could ever do so, but when they become fatigued, often they will acknowledge that you have them cold.”
Cold (adjective)
Not pungent or acrid.
Cold (adjective)
Unexciting; dull; uninteresting.
Cold (adjective)
Affecting the sense of smell (as of hunting dogs) only feebly; having lost its odour.
“a cold scent”
Cold (adjective)
Not sensitive; not acute.
Cold (adjective)
Distant; said, in the game of hunting for some object, of a seeker remote from the thing concealed. Compare warm and hot.
“You’re cold … getting warmer … hot! You’ve found it!”
Cold (adjective)
Having a bluish effect; not warm in colour.
Cold (adjective)
Rarely used or accessed, and thus able to be relegated to slower storage.
Cold (noun)
A condition of low temperature.
“Come in, out of the cold.”
Cold (noun)
A common, usually harmless, viral illness, usually with congestion of the nasal passages and sometimes fever.
“I caught a miserable cold and had to stay home for a week.”
Cold (adverb)
While at low temperature.
“The steel was processed cold.”
Cold (adverb)
Without preparation.
“The speaker went in cold and floundered for a topic.”
Cold (adverb)
With finality.
“I knocked him out cold.”
Cold (adverb)
In a cold, frank, or realistically honest manner.