Si (Noun)
Meaning 1
A tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors.
Classification
Nouns denoting substances.
Examples
- Silicon is used in the production of computer chips.
- Silicon is an essential element in many types of rocks and minerals.
- When heated with silicon, certain metals can react violently.
- The refractory properties of silicon are also utilized in the manufacture of fireplaces.
- To make semiconductors and solar panels, crystalline silicon is sometimes used.
Synonyms
Hypernyms
Meaning 2
A complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites".
Classification
Nouns denoting quantities and units of measure.
Examples
- The Systeme International d'Unites, abbreviated as SI, has become the standard system of units globally, making conversions easier for scientists.
- Professor Smith explained that the base units of the SI include meter, kilogram, second, ampere, kelvin, mole, and candela.
- As a chemist, Dr. Thompson measures out a precise mole of the substance according to the SI standards to ensure an accurate reaction.
- The technicians made sure that the electrical wiring was compatible with the SI definitions to prevent any miscalculations.
- In a chemistry lab, Mrs. Patel asked her students to use the SI unit of measurement to calculate the amount of electric current flowing through the wire.
Synonyms
- SI Unit
- SI System
- International System Of Units
- Systeme International D'Unites
- International System
- Systeme International
Hypernyms
Meaning 3
The syllable naming the seventh (subtonic) note of any musical scale in solmization.
Classification
Nouns denoting communicative processes and contents.
Examples
- The song modulated to the key of G, ending on si, which added a sense of tension to the finale.
- The musician used the syllable si to help her learn the solfège of the melody.
- In the do re mi fa so la ti si system of solmization, the note si is often sung as "te".
- The music teacher wrote the solfège for the difficult passage, underscoring the si that the students tended to sing flat.
- The choral arrangement began with a long si that swelled into a full-throated fa.