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log 1 (lôg, lŏg)
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n.
1.
a. A usually large section of a trunk or limb of a fallen or felled tree.
b. A long thick section of trimmed, unhewn timber.
2. Nautical
a. A device trailed from a ship to determine its speed through the water.
b. A record of a ship's speed, its progress, and any shipboard events of navigational importance.
c. The book in which this record is kept.
3. A record of a vehicle's performance, as the flight record of an aircraft.
4. A record, as of the performance of a machine or the progress of an undertaking: a computer log; a trip log.
v. logged, log·ging, logs
v.tr.
1.
a. To cut down, trim, and haul the timber of (a piece of land).
b. To cut (timber) into unhewn sections.
2. To enter in a record, as of a ship or an aircraft.
3. To travel (a specified distance, time, or speed): logged 30,000 air miles in April.
4. To spend or accumulate (time): had logged 25 years with the company.
v.intr.
To cut down, trim, and haul timber.
Phrasal Verbs:
log in (or on)
To enter into a computer the information required to begin a session.
log out (or off)
To enter into a computer the command to end a session.

[Middle English logge.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
log 2 (lôg, lŏg)
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n.
A logarithm.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
-log
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suff.
Variant of -logue.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
log-
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pref.
Variant of logo-.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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:

    Indo-European Roots

    Semitic Roots

    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.

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