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Hmdictenglang2016
This new edition offers newly updated terms, and provides the latest research on word origins and meanings, with guidelines on accurate usage.
Editor(s): Editors of the American Heritage Dictionaries
Edition: 6th
Articles: 94,107
Images: 4,330
Audio files: 69,315
People: 305

Headings

Special Contributors and Consultants
Introduction
Editorial and Production Staff
The Usage Panel
Usage in The American Heritage Dictionary
Variation and Change in Our Living Language
Guide to Appendix I
Guide to The Semetic Roots (Appendix II)
Appendix I: Indo-European Roots
Indo-European and the Indo-Europeans
Appendix II: Roots

Articles

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101

  Elementary; basic: You should never leave your baby alone in the bathtub—that's just parenting 101.   [From the common use of the number 1

24-7

24-7   Continuously; unceasingly.   [Short for 24 hours a day, 7 days a week.]

3D

3D   Three-dimensional.   n.   A three-dimensional medium, display, or performance, especially a cinematic or graphic medium in three dim

3D printer

  A computer-controlled device that is capable of fabricating three-dimensional objects, as by extruding layers of plastic from a robotically con

401(k)

401(k)   A retirement investment plan that allows an employee to put a percentage of earned wages into a tax-deferred investment account selected

411

411   Information or knowledge, especially when acquired by word of mouth.   [From 411, a telephone number for telephone directory informatio

4-H Club

4-H Club   A youth organization sponsored by the Department of Agriculture and offering instruction in agriculture, home economics, and other fie

4WD

  four-wheel drive

8-chlorotheophylline

  A stimulant, C7H7N4O2Cl, that is used to form a salt with certain pharmaceutical drugs, such as diphenhydramine.   [8-, conventional numbe

9/11

9/11   September 11, 2001, the date on which two hijacked airliners were flown into the World Trade Center in New York City and another into the

A

1. accusative 2. Games ace 3. across 4. adenine 5. alto 6. ampere 7. or Å angstrom 8. answer 9. area 10. Spor

a.

1. acre 2. adjective 3. Latin anno (in the year) 4. Latin annus (year) 5. anode 6. Latin ante (before) 7. anterior

a- 1

  Without; not: amoral.   [Greek; see ne in the Appendix of Indo-European roots.]

a 1

a 1 1. The first letter of the modern English alphabet. 2. Any of the speech sounds represented by the letter a. 3. The first in a series

A1C

  airman first class