adj. sol·id·er, sol·id·est
a. Of definite shape and volume; not liquid or gaseous: It was so cold the water in the bucket became solid.
b. Mathematics Of or relating to three-dimensional geometric figures or bodies.
c. Firm or compact in substance: The floor was solid and would not give way.
a. Not hollowed out: a solid block of wood.
b. Being the same substance or color throughout: solid gold.
c. Having no gaps or breaks; continuous: a solid line of people; worked for a solid week.
d. Acting together; unanimous: a solid voting bloc.
e. Written without a hyphen or space. For example, the word software is a solid compound.
f. Printing Having no leads between the lines.
a. Of good quality: off to a solid start.
b. Substantial; hearty: a solid meal.
c. Sound; reliable: solid facts.
d. Financially sound: a solid business.
e. Upstanding or dependable: a solid citizen.
f. Slang Excellent; first-rate.
1. A substance having a definite shape and volume; one that is neither liquid nor gaseous.
2. Mathematics A geometric figure having three dimensions.
1. Without a break or opening; completely or continuously: The theater was booked solid for a month.
2. As a whole; unanimously: The committee voted solid for the challenger.
[Middle English solide, from Old French, from Latin solidus; see sol- in the Appendix of Indo-European roots.]
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:
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.