What is the fullform of AM and PM?

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Rushil

Ante Meridiem (AM)

Ante Meridian
Latin = "before midday" - before noon

Post Meridiem (PM)

Post Meridian
Latin = "after midday" - after noon

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Terms 12 a.m. and 12 p.m. cause confusion and should not be used as neither the "12 am" nor the "12 pm" designation is technically correct.

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It advisable to use 12 noon and 12 midnight where clarity is required

ramarao p

Ante Meredian and Post Meredian...so simple this was taught some time in sixth standard Social Studies subject.

raindrops

AM - ante meridian
implies to time between 00.00 midnight to 12.00 noon

PM - post meridian
implies to time between 12.00noon and 00.00 midnight

vakayil k

A.M. and p.m. are used as short forms for many words.

However, A.M. and P.M. are mostly used in relation with time. A.M. means Ante Meridiem, i.e. before noon and P.M. means Post meridiem.

For other usages of A.M. and P.M., please check the following links:

http://en.wikipedia.org/wiki/AM

http://en.wikipedia.org/wiki/P.m.

Handy

AM : After moonlite
PM : post moonlite

banjaran

A.M. abbreviation ante meridiem
Main Entry: anÂ·te meÂ·riÂ·diÂ·em
Pronunciation:
"an-ti-m&-'ri-dE-&m, -dE-"em
Function: adjective
Etymology: Latin
Date: 1563
Meaning: being before noon

P.M. abbreviation post meridiem
Main Entry: post meÂ·riÂ·diÂ·em
Pronunciation: -m&-'ri-dE-&m, -"em
Function: adjective
Etymology: Latin
Date: 1647
Meaning: being after noon

CaptAnil

AM - Sober
PM - Drunk
Hic ;-)

shadows

It all depends on the context..
WRT time, where digits are mentioned next to the am or pm,
AM = Ante Meredian and
PM = Post Meredian

Some other context fullforms
AM = Assistant manager /

PM = Project/ Product manager
:: Prime Minister
:: Parliament Member

Ronnie @ BinBrain.Com

AM that is Ante meridiem, means before midday.
PM that is post meridiem,means after midday.

Meridiem is a Latin word that means midday.

PREET G

AM means Anti meridian
PM means Post meridian

bhasi

The 12-hour clock is a timekeeping convention in which the 24 hours of the day are divided into two periods[1] called ante meridiem (a.m., Latin "before noon") and post meridiem (p.m., "after noon").

I believe this answers your question :)

Enjoy!