half - meaning and definition. What is half
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What (who) is half - definition

IRREDUCIBLE FRACTION
0.5; ½; Halves; One-half; Half; .5; 0.5 (number); 1 half; 1⁄2; 2^-1
  • [[Eye of Horus]]
  • Postal stamp, Ireland, 1940: one halfpenny postage due.

half         
(halves)
Frequency: The word is one of the 700 most common words in English.
1.
Half of an amount or object is one of two equal parts that together make up the whole number, amount, or object.
They need an extra two and a half thousand pounds to complete the project...
More than half of all households report incomes above ?35,000...
Cut the tomatoes in half vertically...
FRACTION
•
Half is also a predeterminer.
We just sat and talked for half an hour or so...
They had only received half the money promised...
PREDET
•
Half is also an adjective.
...a half measure of fresh lemon juice...
Steve barely said a handful of words during the first half hour.
ADJ: ADJ n
2.
You use half to say that something is only partly the case or happens to only a limited extent.
His eyes were half closed...
His refrigerator frequently looked half empty...
She'd half expected him to withdraw from the course.
ADV: ADV adj, ADV before v
3.
In games such as football, rugby, and basketball, matches are divided into two equal periods of time which are called halves.
The only goal was scored by Jakobsen early in the second half.
N-COUNT: usu ord N
4.
A half is a half-price bus or train ticket for a child. (BRIT)
N-COUNT
5.
You use half to say that someone has parents of different nationalities. For example, if you are half German, one of your parents is German but the other is not.
She was half Italian and half English.
ADV: ADV adj
6.
You use half past to refer to a time that is thirty minutes after a particular hour.
'What time were you planning lunch?'-'Half past twelve, if that's convenient.'...
PREP-PHRASE: usu PREP num
7.
Half means the same as half past
. (BRIT INFORMAL)
They are supposed to be here at about half four.
PREP: PREP num
8.
You can use half before an adjective describing an extreme quality, as a way of emphasizing and exaggerating something. (INFORMAL)
He felt half dead with tiredness...
ADV: ADV adj [emphasis]
•
Half can also be used in this way with a noun referring to a long period of time or a large quantity.
I thought about you half the night...
He wouldn't know what he was saying half the time...
PREDET
9.
Half is sometimes used in negative statements, with a positive meaning, to emphasize a particular fact or quality. For example, if you say 'he isn't half lucky', you mean that he is very lucky. (BRIT INFORMAL)
You don't half sound confident...
'There'd been a tremendous amount of poverty around and presumably this made some impact then.'-'Oh not half.'
ADV: with neg, usu ADV before v, ADV adj/adv, ADV n, also ADV as reply [emphasis]
10.
You use not half or not half as to show that you do not think something is as good or impressive as it is meant to be.
You're not half the man you think you are...
ADV: with neg, ADV n, ADV as/so adj [emphasis]
11.
When you use an expression such as a problem and a half or a meal and a half, you are emphasizing that your reaction to it is either very favourable or very unfavourable.
It becomes clear that Montgomerie has a job and half on his hands.
PHRASE: usu v-link PHR [emphasis]
12.
If you say that someone never does things by halves, you mean that they always do things very thoroughly.
In Italy they rarely do things by halves. Designers work thoroughly, producing the world's most wearable clothes in the most beautiful fabrics.
PHRASE: with brd-neg, V inflects
13.
If two people go halves, they divide the cost of something equally between them.
He's constantly on the phone to his girlfriend. We have to go halves on the phone bill which drives me mad.
PHRASE: V inflects, oft PHR on n
14.
half the battle: see battle
half         
n.
Moiety.
Half         
·adj Part; side; behalf.
II. Half ·vt To halve. [Obs.] ·see Halve.
III. Half ·adj Consisting of a moiety, or half; as, a half bushel; a half hour; a half dollar; a half view.
IV. Half ·adj Consisting of some indefinite portion resembling a half; approximately a half, whether more or less; partial; imperfect; as, a half dream; half knowledge.
V. Half ·adj One of two equal parts into which anything may be divided, or considered as divided;
- sometimes followed by of; as, a half of an Apple.
VI. Half ·adv In an equal part or degree; in some pa/ appro/mating a half; partially; imperfectly; as, half-colored, half done, half-hearted, half persuaded, half conscious.

Wikipedia

One half

One half (PL: halves) is the irreducible fraction resulting from dividing one by two (2) or the fraction resulting from dividing any number by its double. Multiplication by one half is equivalent to division by two, or "halving"; conversely, division by one half is equivalent to multiplication by two, or "doubling". One half often appears in mathematical equations, recipes, measurements, etc. Half can also be said to be one part of something divided into two equal parts.

For instance, the area S of a triangle is computed.

S = base/2 × perpendicular height.

One half also figures in the formula for calculating figurate numbers, such as triangular numbers and pentagonal numbers:

n 2 [ ( s − 2 ) n − ( 4 − s ) ] {\displaystyle {\frac {n}{2}}{\left[\left(s-2\right)n-(4-s)\right]}}

and in the formula for computing magic constants for magic squares

M 2 ( n ) = n 2 ( n 2 + 1 ) {\displaystyle M_{2}(n)={\frac {n}{2}}\left(n^{2}+1\right)}

The Riemann hypothesis states that every nontrivial complex root of the Riemann zeta function has a real part equal to 1/2.

One half has two different decimal expansions, the familiar 0.5 and the recurring 0.49999999... It has a similar pair of expansions in any even base. It is common to believe these expressions represent distinct numbers: see the proof that 0.999... equals 1 for a detailed discussion of a related case. In odd bases, one half has no terminating representation, only a single representation with a repeating fractional component, such as 0.11111111... in ternary.

https://en.wikipedia.org/wiki/Half
Examples of use of half
1. Among my friends I count a woman who is half–Zimbabwean, half–English; another half–Filipino, half–German Brit; a guy who is half–Dutch, half–Nigerian; and so on.
2. After half an hour I had assembled something that looked half–sheep, half–Bedlington.
3. Half the links are by cable, and half by satellite.
4. Half the ministers have to be Christian and half Muslim.
5. His glass is always half full and never half empty.
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