Semi

pref. half; somewhat, partly

n. (Informal) semitrailer, cargo trailer that is pulled by a trailer truck; tractor trailer, truck cab with an attached semitrailer; semifinal, next-to-last round in a competition; duplex house (British)

Semi- is a Latin prefix to a verb, noun, or adjective meaning "half". Some compounds formed with it are often abbreviated to simply "semi" in appropriate contexts:A semi-automatic firearmA semi-trailer truck (UK: articulated lorry)The watercraft: Semi-submersibleThe time interval in music (UK): Semiquaver, which is half the length of a quaver.The housing type (UK): Semi-detached house.In financial news, semi or semis are often used to refer to the semiconductor industry or the corporations therein.A semi formal (esp. high school) dance.A semi-final of a knockout competition.
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A numerical prefix is a prefix that denotes a number, which is usually a multiplier for the thing being prefixed. Numerical prefixes are usually derived from the words for numbers in various languages, most commonly Greek and Latin, although this is not necessarily the case.Numerical prefixes occur in five contexts:They occur in 19th, 20th and 21st century coinages, mainly the terms that are used in relation to or that are the names of technological innovations, such as and .They occur in constructed words such as systematic names. Systematic names use numerical prefixes derived from Greek, with one principal exception, . They occur as prefixes to units of measure in the SI system. See SI prefixes.They occur as prefixes to units of computer data. See binary prefixes.They occur in words in the same languages as the original number word, and their respective derivatives. (Strictly speaking, some of the common citations of these occurrences are not in fact occurrences of the prefixes. For example: is not formed from , but is in fact derived from the same shared Latin root – .)
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Semiconductor Equipment and Materials International (SEMI) is a trade organization of manufacturers of equipment and materials used in the fabrication of semiconductor devices such as integrated circuits, transistors, diodes, and thyristors. Among other activities, SEMI acts as a clearinghouse for the generation of standards specific to the industry and the generation of long-range plans for the industry.
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Noun
1. one of the two competitions in the next to the last round of an elimination tournament
(synonym) semifinal
(hypernym) match
(part-holonym) elimination tournament
2. a truck consisting of a tractor and trailer together
(synonym) trailer truck, tractor trailer, trucking rig, rig, articulated lorry
(hypernym) truck, motortruck
(hyponym) tandem trailer
(part-meronym) semitrailer
3. a trailer having wheels only in the rear; the front is supported by the towing vehicle
(synonym) semitrailer
(hypernym) trailer
(part-holonym) trailer truck, tractor trailer, trucking rig, rig, articulated lorry

pref. semi, half; somewhat

pref. quasi, resembling, like

adj. quasi, semi

n. seed, pip; semen; pit, kernel