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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

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

From Science Daily • Feb. 13, 2026

Plus, when semi companies earn or raise money, they spend it because they’re always building new factories, new construction.

From Barron's • Feb. 12, 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 was behind them, driving the Shop — a forty-foot trailer pulled by a Mack semi tractor — by himself.

From "Storm Runners" by Roland Smith

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