- A crapella
- a New York minute
- A/N
- A/S/L/P
- A2D
- A3
- AAA Server
- AAAAA
- AAC
- AAF
- AAK
- AAMOF
- AAMOI
- AAP
- AAR
- AAR8
- AAS
- AATK
- AAYF
- AB
- ab/abt
- abbreviation
- ABC
- ABCD
- ABH
- ABI - Binary
- ABI - Broker
- ABITHIWTITB
- ABK
- above the fold
- ABT2
- ac or .ac
- ACC
- access
- access control
- access control list
- access devices
- access number
- access provider
- access rights
- access time
- account
- ACD
- ACE
- ACK
- ACM
- ACORN
- acqhire
- acquisition
- acquisition cost
- Acrobat
- acronym
- actionable
- active
- Active Server Pages
- ActiveX
- ad banner
- ad blocking
- ad click
- ad click rate
- ad exchange
- ad fraud
- ad network
- ad overlay
- ad request
- ad server software
- ad space
- ad view
- ADAD
- ADBB
- ADC
- add
- address
- Address Resolution Protocol (ARP)
- addy
- ADIDAS
- ADIH
- ADIP
- ADM
- adminisphere
- administrivia
- ADN
- ADPCM
- ADR
- ADSL
- adulting
- ADVD
- advermation
- advertainment
- advertorial
- adware
- AEAP
- AF
- AFAGAY
- AFAHMASP
- AFAIC
- AFAICS
- AFAICT
- AFAIK
- AFAIR
- AFAIU
- AFAIUI
- AFAP
- AFAYC
- AFC
- AFDN
- affiliate
- affiliate link
- affiliate marketing
- affiliate tracking
- affinity analysis
- AFGO
- AFIAA
- AFINIAFI
- AFJ
- AFK
- AFPOE
- AFT
- aftcasting
- AFU
- AFW
- AFZ
- AGB
- age
- agent or intelligent agent
- aggregate data
- aggregation or aggregate
- aggregator
- AGI
- AGIG
- AGKWE
- agreeance
- AI
- AI ghost
- AI wrapper
- AI/ML
- AIAMU
- AIF or .aif
- aight
- AIH
- AIMB
- AIMP
- air
- AirCard
- airplane mode
- AISB
- AISE
- AISI
- AITR
- AIX
- Ajax
- AKA or a.k.a.
- al capone
- ALAP
- alcon
- ALF
- algorithm
- algorithm-based software
- alias
- aliasing and anti-aliasing
- all your base are belong to us
- all-channel
- allocation
- allow
- almost online
- ALOL
- ALOTBSOL
- alpha
- alpha geek
- alpha pup
- alphanumeric
- alt or alt.
- alt tag
- alt text
- alt-right
- alt-tab
- Alta-visitors
- ALTG
- Altoids
- ALW
- always-on
- AMA
- AMAP
- Amazon-ized
- Amazonned
- ambient noise
- AMBW
- america offline
- america onhold
- AMF
- AML
- AMOSC
- AMP
- AMPS
- AMRMTYFTS
- anacronym
- analog
- anchor
- Android
- ANFAWFOS
- ANFSCD
- ANGB
- angels
- angry garden salad
- animated GIF
- animation
- anime
- animersive
- Ann Curry-ed
- annotations
- anomaly
- anonymize
- Anonymous
- anonymous FTP
- anonymous posting
- ANSI
- ant farm
- antennagate
- anti-
- anti-social networking
- anticipointment
- antivirus software
- anus envy
- any key
- AOAS
- AOB
- AOL winsock
- AON
- AOR
- AOYP
- AP
- APAC
- Apache
- API
- APNIC
- apollo syndrome
- app
- Apple key
- applet
- application
- application server
- application server solution
- April 14, 2000
- APU
- apyware
- AR
- AR headset
- ARC
- arc word
- Archie
- architect
- architecture
- architecture police
- archive
- archive site
- ARIN
- ARP
- ARPA
- ARPANet
- array
- arrow shooters
- article
- artifact
- artificial intelligence
- artificial life
- AS
- ASAFP
- ASAMOF
- ASAP
- ASAYGT
- ascending order
- ASCII
- ASCII art
- ASCII bashing
- ASCII-armored
- askhole
- ASL
- ASLMH
- ASMR
- ASP
- aspect-oriented programming
- asset-backward
- ASSHO1E
- assicons
- assmosis
- astroturf
- astroturf campaign
- asynchronous
- asynchronous learning
- at home or @HOME Network
- at sign or @
- ATAB
- ATBIMS
- ATC
- ATM
- Atom
- atomic memory
- ATSL
- ATST
- attachment
- attachment parent
- attention currency
- attention economy
- attenuation
- attic
- attribute
- ATW
- ATWD
- AU or .au
- audience extension
- audio
- audio helper
- audio mining
- audio storage unit
- audiocast
- auditor
- augmented reality
- AUNT
- AUNTM
- AUP
- authentication
- author
- authorization
- authortisement
- auto answer
- auto-parser
- auto-play
- autobot
- automated purchasing system
- autopen
- autoresponder
- avatar
- average time per page request
- AVI
- AWC
- awesome sauce
- AWGTHTGTTA
- AWHFY
- AWLTP
- AWNIAC
- AWOL
- AWS
- AWTTW
- ax
- AYB content
- AYC
- AYCE
- AYEG
- AYFKMWTS
- AYK
- AYMM
- AYOR
- AYSOS
- AYTMTB
- AYV
