online

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online [adjective]

Describes products, services, or information that can be bought or used on the internet

US /ˈɑːn.laɪn/ 
UK /ˈɒn.laɪn/ 
Example: 

An online newspaper/magazine/dictionary

Oxford Essential Dictionary

online

 adjective, adverb
using a computer or the Internet:
Online shopping is both cheap and convenient.
Bookings can be made online.

Longman Dictionary of Contemporary English

online

online /ˈɒnlaɪn $ ˈɑːn-, ˈɒːn-/ BrE AmE adjective
1. connected to other computers through the Internet, or available through the Internet OPP offline:
All the city’s schools will be online by the end of the year.
2. directly connected to or controlled by a computer OPP offline:
an online printer
—online adverb:
The reports are not available online yet.

Oxford Advanced Learner's Dictionary

online

I. on·line [online]   [ˌɒnˈlaɪn]    [ˌɑːnˈlaɪn]    [ˌɔːnˈlaɪn]  adjective
controlled by or connected to a computer or to the Internet
Online shopping is both cheap and convenient.
an online database
online dating (= using the Internet to meet people in order to start a romantic relationship)  
Collocations:
Email and the Internet
Email
receive/get/open an email
write/send/answer/forward/delete an email
check/read/access your email
block/filter (out) junk/spam/unsolicited email
exchange email addresses
open/check your inbox
junk mail fills/floods/clogs your inbox
have/set up an email account
open/send/contain an attachment
sign up for/receive email alerts
Connecting to the Internet
use/access/log onto the Internet/the Web
go online/on the Internet
have a high-speed/dial-up/broadband/wireless (Internet) connection
access/connect to/locate the server
use/open/close/launch a/your web browser
browse/surf/search/scour the Internet/the Web
send/contain/spread/detect a (computer/email) virus
update your anti-virus software
install/use/configure a firewall
accept/enable/block/delete cookies
Using the Internet
visit/check a website/an Internet site/sb's blog
create/design/launch a website/social networking site
start/write/post/read a blog
update your blog/a website
be in/meet sb in/go into/enter an Internet chat room
download/upload music/software/a song/a podcast/a file/a copy of sth
share information/data/files
post a comment/message on a website/an online message board/a web forum/an internet chat room
stream video/audio/music/content over the Internet
join/participate in/visit/provide a (web-based/web/online/Internet/discussion) forum

generate/increase/monitor Internet traffic

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

online / ˈɒn.laɪn /   / ˈɑːn.laɪn / adjective [ before noun ]

A2 describes products, services, or information that can be bought or used on the internet:

an online newspaper/magazine/dictionary

online banking/shopping

© Cambridge University Press 2013

Collins Advanced Learner’s English Dictionary

online

 

/ɒnlaɪn/
also on-line

1.
If a company goes online, its services become available on the Internet. (BUSINESS, COMPUTING)
...the first bank to go online.
...an online shopping centre.
...an online catalogue.
ADJ

2.
If you are online, your computer is connected to the Internet. Compare offline. (COMPUTING)
You can chat to other people who are online.
ADJ

Online is also an adverb.
...the cool stuff you find online.
on line: see line
ADV: ADV after v

Merriam-Webster's Advanced Learner's Dictionary

online

on·line /ˈɑːnˌlaɪn/ adj
1 : connected to a computer, a computer network, or the Internet
• an online printer
• The city libraries are all online.
2 : done over the Internet
• He likes to engage in online chats/discussions.
online shopping/banking
• the company's online sales
- opposite off-line
- online adv
• people who shop/chat online
• I went online to do a search for information about new cars.
• She spends a lot of her free time online.