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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.

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

This adaptation appears repeatedly in the fossil record among fish eating animals, including aquatic ichthyosaurs, semi aquatic crocodile and flying pterosaurs.

From Science Daily • Feb. 23, 2026

Dominic Loehle delivers the winning basket to break a 42-42 tie with 25 seconds left in Heritage Christian’s 45-42 win over Anaheim Canyon in tourney semi at Sonora.

From Los Angeles Times • Dec. 13, 2025

My home is the Victorian semi on the tracks, the one I part-owned.

From "The Girl on the Train" by Paula Hawkins

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