Dictionary Definition
gain
Noun
1 a quantity that is added; "there was an
addition to property taxes this year"; "they recorded the cattle's
gain in weight over a period of weeks" [syn: addition, increase]
2 the advantageous quality of being beneficial
[syn: profit]
3 the amount of increase in signal power or
voltage or current expressed as the ratio of output to input [syn:
amplification]
4 the amount by which the revenue of a business
exceeds its cost of operating [ant: loss]
Verb
1 obtain; "derive pleasure from one's garden"
[syn: derive]
2 win something through one's efforts; "I
acquired a passing knowledge of Chinese"; "Gain an understanding of
international finance" [syn: acquire, win] [ant: lose]
4 reach a destination, either real or abstract;
"We hit Detroit by noon"; "The water reached the doorstep"; "We
barely made it to the finish line"; "I have to hit the MAC machine
before the weekend starts" [syn: reach, make, attain, hit, arrive
at]
5 obtain advantages, such as points, etc.; "The
home team was gaining ground"; "After defeating the Knicks, the
Blazers pulled ahead of the Lakers in the battle for the numberone
playoff berth in the Western Conference" [syn: advance, win, pull ahead,
make
headway, get ahead,
gain
ground] [ant: fall
back]
6 rise in rate or price; "The stock market gained
24 points today" [syn: advance]
7 increase in; "gain momentum"; "gain
nerve"
8 earn on some commercial or business
transaction; earn as salary or wages; "How much do you make a month
in your new job?"; "She earns a lot in her new job"; "this merger
brought in lots of money"; "He clears $5,000 each month" [syn:
take in,
clear, make, earn, realize, realise, pull in, bring in]
9 increase (one's body weight); "She gained 20
pounds when she stopped exercising" [syn: put on] [ant:
reduce]
User Contributed Dictionary
English
Pronunciation
 /geɪn/, /geIn/

 Rhymes: eɪn
Noun
 The act of gaining.
 What one gains, as a return on investment or dividend.
 No pain, no gain.
 The factor by which a signal is multiplied.
Translations
act of gaining
 Finnish: voittaminen, voitto
what one gains (profit)
 Czech: zisk
 Dutch: winst
 Finnish: voitto, hyöty
 German: Gewinn
factor by which signal is multiplied
 Finnish: vahvistus
Translations to be checked
 ttbc French: gain
 ttbc Italian: guadagno (2) , vincita (2)
 ttbc Norwegian: vinning (2), gevinst (2)
 ttbc Interlingua: ganio (1,2)
 ttbc Korean: 얻음 (eoteum)
 ttbc Portuguese: ganho (1,2)
 ttbc Romanian: câştig
 ttbc Telugu: లాభము (lAbhamu) (2)
 ttbc Turkish: kazanmak
Antonyms
Verb
 : To acquire possession of what one did not have before.
Translations
acquire
Basque
Noun
gainExtensive Definition
In electronics, gain is a
measure of the ability of a circuit
(often an amplifier)
to increase the power or
amplitude of a
signal. It is usually defined as the mean ratio of the
signal output of a system to the
signal input of the same system. It may also be defined as the
decimal logarithm of
the same ratio.
Thus, the term gain on its own is ambiguous. For example, 'a
gain of five' may imply that either the voltage, current or the power is
increased by a factor of five. Furthermore, the term gain is also
applied in systems such as sensors where the input and
output have different units; in such cases the gain units must be
specified, as in "5 microvolts per photon" for a photosensor.
In laser
physics, gain may refer to the increment of power along the
beam propagation in a gain medium,
and its dimension is m1 (inverse meter) or 1/meter.
Logarithmic units and decibels
Power gain
Power gain, in decibels (dB), is defined as follows: Gain=10 \log \left( \right)\ \mathrm
A similar calculation can be done using a
natural
logarithm instead of a decimal logarithm. The result is then in
nepers instead of
decibels.
Voltage gain
When power gain is calculated using voltage
instead of power, making the substitution (P=V 2/R),
the formula is:
 Gain=10 \log\ \mathrm
In many cases, the input and output impedances
are equal, so the above equation can be simplified to:
 Gain=10 \log \left( \right)^2\ \mathrm
and then:
 Gain=20 \log \left( \right)\ \mathrm
This simplified formula is used to calculate a
voltage gain in decibels, and is equivalent to a power gain only if
the impedances
at input and output are equal.
Current gain
In the same way, when power gain is calculated using current instead of power, making the substitution (P=I 2R), the formula is: Gain=10 \log \ \mathrm
In many cases, the input and output impedances
are equal, so the above equation can be simplified to:
 Gain=10 \log \left( \right)^2\ \mathrm
and then:
 Gain=20 \log \left( \right)\ \mathrm
This simplified formula is used to calculate a
current gain in decibels, and is equivalent to the power gain only
if the impedances
at input and output are equal.
Example
Q. An amplifier has an input impedance of 50 ohms and drives a load of 50 ohms. When its input (V_) is 1 volt, its output (V_) is 10 volts. What are its voltage gain and power gain?A. Voltage gain is simply:
 \frac=\frac=10\ \mathrm.
 \frac=\frac=\frac=100\ \mathrm.
 G_=10 \log G_=10 \log 100=10 \times 2=20\ \mathrm.
A gain of factor 1 (equivalent to 0 dB) where
both input and output are at the same voltage level and impedance
is also known as unity
gain.
See also
 Transmitter power output
 Absolute gain (physics)
 Loop gain
 Insertion gain
 Power gain
 Directive gain
 Net gain
 Process gain
 Signal processing gain
 Automatic gain control
 Attenuation (loss), Aperturetomedium coupling loss, Effective radiated power
 gain medium
gain in Arabic: أرباح
gain in Catalan: Guany
gain in German: Verstärkung (Physik)
gain in Spanish: Ganancia (electrónica)
gain in French: Gain (électronique)
gain in Italian: Guadagno (elettronica)
gain in Japanese: 利得 (電気工学)
gain in Polish: Współczynnik wzmocnienia
gain in Portuguese: Ganho
gain in Sundanese: Gain
gain in Chinese: 增益
Synonyms, Antonyms and Related Words
accept,
access, accession, accomplish, accretion, accrual, accrue, accruement, accumulate, accumulation, achieve, achievement, acquire, acquisition, addition, admit, advance, advantage, aggrandizement, ameliorate, amend, amplification, appreciate, appreciation, approach, argue into, arrive, arrive at, arrive in,
ascent, assume, attain, attain to, attainment, augmentation, avail, available gain, bag, balloon, ballooning, be received, be
responsible for, be seized of, bear the palm, behalf, behoof, benefit, benison, blessing, bloat, bloating, blow in, bob up,
boom, boon, boost, breed, bring down, bring in, bring
on, bring over, bring round, bring to reason, bring upon, broaden, broadening, buildup, capital gains, captivate, capture, carry, carry away, carry it, carry
off, carry the day, catch,
catch up with, charm,
check in, cleanup,
clear, clear profit, clock
in, close with, collect,
come, come along, come by,
come in, come in for, come into, come on, come out first, come to,
come to hand, come up to, come up with, complete, con, consummate, contract, convalesce, convince, corral, crescendo, cure, current gain, cut, dead time, derive, derive from, develop, development, dividend, dividends, drag down, draw, draw from, draw over,
earn, earnings, edema, elevation, emolument, enhancement, enlargement, enter into
possession, expansion,
extension, fall in
with, fall into, fetch,
fetch up at, filthy lucre, find, finish in front, flood, fluke, fulfill, gain ground, gain on,
gain over, gain strength, gain the day, gain upon, gains, garner, gather, get, get ahead, get along, get
better, get in, get there, get to, gettings, glean, gleanings, go ahead, go
forward, go up, good,
graduate, greatening, gross, gross profit, grow, grow better, growth, gush, harvest, have, have coming in, heal, hike, hit, hit town, hoard, holdup, hook, hook in, hysteresis, improve, improvement, income, increase, increment, incur, inflation, intensify, interest, invigorate, invite, it, jump, killing, lag, lap, leap, leave behind, leave standing,
look up, lucre, make, make a killing, make headway,
make it, make progress, make strides, makings, margin, meliorate, mend, money, mount, mounting, multiplication, multiply, narrow the gap, neat
profit, net, net profit,
obtain, operational gain,
outdistance,
outpace, output lag,
outrun, outsail, outstrip, outtalk, overhaul, overtake, paper profits,
pass, pay, payment, pelf, percentage, perfect, perk, perk up, perks, perquisite, persuade, pick up, pickings, pop up, prevail on,
prevail upon, prevail with, proceeds, process lag, procure, produce, productiveness, profit, profits, progress, proliferate, proliferation, pull down,
pull in, punch in, raise,
rakeoff, rally, reach, realize, reap, receipts, receive, recuperate, remedy, renew, return, returns, revenue, ring in, rise, roll in, run, run up, sack, score, secure, sell, sell one on, shape up,
share, shoot up, show
improvement, show up, sign in, skyrocket, snowball, snowballing, spread, store, strengthen, succeed, surge, sway, swell, swelling, take, take in, take off, take on,
take over, take the cake, takein, talk into, talk over, throughput, time constants,
time in, time lead, tumescence, turn up, up, upping, upsurge, upswing, uptrend, upturn, wangle, wangle into, wax, waxing, wealth, wear down, welcome, welfare, wellbeing, widen, widening, win, win out, win over, win the
battle, win the laurels, win the palm, win the prize, win through,
winnings, world of
good, yield