on·line or on-line (ŏnlīn, ôn-)
a. Connected to a central computer or to a computer network: The workers' terminals are online during business hours.
b. Accessible via a computer or computer network: an online database.
c. Conducted or facilitated by means of a computer network: online dating.
2. In production or operation, often as part of a supply chain: Is the new factory online yet?
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.