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Definitions

semi-

[sem-ee, sem-ahy] / ˈsɛm i, ˈsɛm aɪ /
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
semi
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

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.

He said he has also purchased around 80 of Nikola’s semi trucks out of bankruptcy.

From The Wall Street Journal • Mar. 18, 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

A BBC reporter on the scene said two police officers were guarding the door of a semi detached house behind a police cordon.

From BBC • Nov. 13, 2025

Tomás jogged over to the semi and fired it up.

From "Storm Runners" by Roland Smith

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