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Definitions

semi

[sem-ee, sem-ahy] / ˈsɛm i, ˈsɛm aɪ /
NOUN
eighteen-wheeler
Synonyms
WEAK
18-wheeler big rig rig semitrailer trailer truck truck trailer
NOUN
truck
Synonyms
STRONGEST
car crate freighter jeep lorry pickup rig van wagon
STRONG
buggy carryall dump wheels
WEAK
eighteen-wheeler four by eight four by four four-wheel drive
semi-
ADJECTIVE
quasi
Synonyms
WEAK
apparent apparently fake mock near nominal partly pretended pseudo- seeming seemingly sham so-called supposedly synthetic virtual would-be
Antonyms
WEAK
entire total whole

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“I think why people have been gravitating towards semi cap and memory and some of these ‘picks and shovels’ is, they’re the beneficiaries of all that capex,” he said.

From Barron's • Apr. 4, 2026

This semi couldn’t have been more David vs.

From The Wall Street Journal • Mar. 19, 2026

They could be without captain Sidney Crosby, who was forced off in their last eight win over Czech Republic with a knee injury and missed the Finland semi.

From BBC • Feb. 22, 2026

These autonomous or semi autonomous systems could anticipate needs and provide support automatically.

From Science Daily • Feb. 13, 2026

Occasionally, she feels the rumble of ground and she’ll look over her shoulder as a semi passes her.

From "A Heart in a Body in the World" by Deb Caletti

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.