solid

1 of 3

adjective

sol·​id ˈsä-ləd 

1

a

: being without an internal cavity

a solid ball of rubber

b(1)

: printed with minimum space between lines

(2)

: joined without a hyphen

a solid compound

c

: not interrupted by a break or opening

a solid wall

2

: having, involving, or dealing with three dimensions or with solids

a solid configuration

3

a

: of uniformly close and coherent texture : not loose or spongy : compact

b

: possessing or characterized by the properties of a solid : neither gaseous nor liquid

solid waste

4

: of good substantial quality or kind

solid comfort

: such as

a

: sound

solid reasons

b

: made firmly and well

solid furniture

c

: reliable

a solid performer

5

a

: having no break or interruption

waited three solid hours

b

: unanimous

had the solid support of the party

c

: intimately friendly or associated

solid with the boss

6

a

: prudent

also : well established financially

b

: serious in purpose or character

7

: of one substance or character: such as

a

: entirely of one metal or containing the minimum of alloy necessary to impart hardness

solid gold

b

: of a single color

solidly adverb

solidness noun

solid

2 of 3

noun

1

: a geometrical figure or element (such as a cube or sphere) having three dimensions see Volume Formulas Table

2

a

: a substance that does not flow perceptibly under moderate stress, has a definite capacity for resisting forces (such as compression or tension) which tend to deform it, and under ordinary conditions retains a definite size and shape

b

: the part of a solution or suspension that when freed from solvent or suspending medium has the qualities of a solid

—usually used in plural

milk solids of protein and lactose

3

: something that is solid: such as

a

: a solid color

b

: a compound word whose members are joined together without a hyphen

4

US slang : favor sense 3a

Ted Evans might be one of those people. … "Can you do me a solid and watch my stuff?" he'll ask, returning the favor if anyone else needs to do the same.

—Laylan Connelly

So her husband did her a solid and dropped her off for the afternoon, where she was free to sketch some of the exhibits …

—Steven Lemongello

solid

3 of 3

adverb

: in a solid manner

also : unanimously

Synonyms

Adjective

• logical
• reasonable
• good
• reasoned
• valid
• sensible
• rational
• hard

Examples of solid in a Sentence

Adjective

Concrete is a solid material.

When ice melts, it passes from a solid to a liquid form.

I was on a liquid diet when I was sick because I couldn't digest solid food.

I was glad to get off the plane and back on solid ground.

The pond was frozen solid.

The ring is solid gold.

a chunk of solid marble

I prefer solid colors like blue or green instead of plaids and stripes.

Noun

She couldn't eat solids after the surgery.

Recent Examples on the Web

Adjective

But Braun was solid before tiring and working through injuries that affected him on the ball over the final month last season. —Troy Renck, Denver Post, 17 Oct. 2025

Its ready-to-wear and accessories division has also proved a solid earner, with sales rising 6 percent in the first half, helping the company outperform its sector peers. —Joelle Diderich, Footwear News, 17 Oct. 2025

Noun

Moreover, plastic pulverization produces fine solids; keeping the enzyme in contact with all surfaces without shearing it to inactivity is an active research topic. —Srishti Gupta, Interesting Engineering, 16 Oct. 2025

Strain stock through a fine mesh sieve into a large stockpot, pushing on the solids to get all the juices. —Kathryn Gregory, Louisville Courier Journal, 14 Oct. 2025

Adverb

That engine, which is solid-fueled and made of carbon fiber composite materials, has been tested nine times on the ground, according to North Korean state media. —Brad Lendon, CNN Money, 11 Oct. 2025

Didn’t work: Perimeter defense While the Valkyries played solid defensively through the five games, opposing guards torched the expansion team. —Nathan Canilao, Mercury News, 4 Aug. 2025

Word History

Etymology

Adjective

Middle English solide, from Middle French, from Latin solidus; akin to Greek holos whole — more at safe

First Known Use

Adjective

14th century, in the meaning defined at sense 1a

Noun

15th century, in the meaning defined at sense 1

Adverb

1651, in the meaning defined above

Phrases Containing solid

• (as) solid as a rock
• packed solid
• regular solid
• rock solid
• solid angle
• solid as a rock
• solid geometry
• solid-looking
• solid of revolution
• solid-state

Rhymes for solid

• squalid
• stolid
• semisolid

Kids Definition

solid

1 of 2 adjective

sol·​id ˈsäl-əd 

1

a

: not hollow

b

: written as one word

a solid compound

2

: having, involving, or dealing with solids : cubic sense 2

a solid geometric shape

3

a

: not loose or spongy : compact

a solid mass of rock

b

: neither gaseous nor liquid

solid ice

solid waste

4

: of good sturdy quality or kind

solid comfort

solid reasons

5

a

: not interrupted

for three solid hours

b

: being in complete agreement : unanimous, united

solid for pay increases

6

a

: thoroughly dependable : reliable

a solid citizen

b

: earnest or important in purpose

solid reading

7

: of one material, kind, or color

solid gold

solid adverb

solidly adverb

solidness noun

solid

2 of 2 noun

1

: a geometric figure or element (as a cube or a sphere) having three dimensions

2

: a solid substance : a substance that keeps its size and shape

Medical Definition

solid

1 of 2 adjective

sol·​id ˈsäl-əd 

1

: being without an internal cavity : not hollow

solid tumors

2

: possessing or characterized by the properties of a solid : neither gaseous nor liquid

3

of immunity : capable of resisting severe challenge

solidly adverb

solid

2 of 2 noun

1

: a substance that does not flow perceptibly under moderate stress, has a definite capacity for resisting forces (as compression or tension) which tend to deform it, and under ordinary conditions retains a definite size and shape

2

: the part of a solution or suspension that when freed from solvent or suspending medium has the qualities of a solid

—usually used in plural

milk solids