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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.

This semi couldn’t have been more David vs.

From The Wall Street Journal • Mar. 19, 2026

Monday’s rally in semi stocks comes after Nvidia and peers initially dropped earlier in the day over fears about potential disruption to the chip supply chain from conflict in the Middle East.

From Barron's • Mar. 9, 2026

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

From Science Daily • Feb. 13, 2026

Kodiak AI, a Mountain View-based tech company, is developing autonomous semi trucks it says will improve safety and efficiency on the roads.

From Los Angeles Times • Feb. 2, 2026

Tomás stopped the semi in front of a chain-link gate.

From "Storm Runners" by Roland Smith

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