SI

1 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" [syn: Systeme International d'Unites, Systeme International, SI system, International System of Units, International System]

2 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 [syn: silicon, atomic number 14]

3 the syllable naming the seventh (subtonic) note of any musical scale in solmization [syn: ti, te]

English

Alternative spellings

• ti

Pronunciation

• /si/

Noun

1. A syllable used in solfège to represent the seventh note of a major scale.

Catalan

Etymology 1

From si.

Conjunction

1. if

See also

• si bé
• si de cas
• si doncs no
• si més no
• si no
• si per cas

Etymology 2

uncertain.

Noun

1. cavity, depression
2. sinus
3. uterus
4. front portion of the breast
5. heart
6. estuary, bay
7. si

See also

• si d'Abraham

Pronoun

1. oneself, each other

Usage notes

Si is the stressed (or "strong", or "tonic") form of the reflexive pronoun es: as such, it is used after prepositions.

See also

• de si mateix
• en si
• entre si
• fora de si
• per a si
• per si mateix
• tornar en si

Czech

Pronoun

, dative

1. myself
2. yourself

   Posluž si. -- Serve yourself.

3. himself
4. herself
5. itself
6. ourselves
7. yourselves
8. themselves
9. oneself

Synonyms

• sobě

Related terms

• se

Danish

Noun

1. sieve

Dutch

Noun

1. musical note; ti

Esperanto

Pronoun

1. himself, herself, itself, themselves, oneself

Ewe

Verb

1. To escape.

French

Etymology 1

si.

Pronunciation

rfc-level check placement of Pronunciation

• /si/, /si/

Conjunction

1. if

Etymology 2

sic.

Interjection

1. yes (used to contradict a negative statement) (often followed by I do, he is, etc., in English to indicate contradiction rather than affirmation).

   Tu ne m’aimes pas, n’est-ce pas ? — Si ! — You don’t like me, do you? — Yes, I do!

Interlingua

Adverb

1. yes

Italian

Etymology

se.

Pronoun

1. In the context of "indefinite": one, you, we, they, people

   Note: In this sense, si is often translated using the passive in English.

   Examples:

   • Non si deve parlare così (One/You/We/They/People shouldn’t speak like that)
   • Si parla italiano qui (Italian is spoken here or One/You/We/They/People speak(s) Italian here)

2. oneself, himself, herself, itself, themselves; (reciprocal) each other, one another.

   Examples:

   • Giovanni si è fatto male (Giovanni has hurt himself)
   • Carlo e Laura si amano (Carlo and Laura love each other)

   Note: With some verbs, si is not translated in English.

   Examples:

   • Marco si è rotto il braccio (Marco has broken his arm)
   • Si è svegliata alle nove (She woke up at nine)

3. (the so-called si passivante, used to form the passive voice of a verb) it (but also see note below)

   Example: Si dice che Maria voleva uccidere Giovanni (It is said that Maria wanted to kill Giovanni).

   Note: In this sense, verb + si is often translated as become or get + past participle in English.

   Examples:

   • Ci vuole un po’ di tempo per abituarsi (It takes a while to become accustomed)
   • A Luca piace ubriacarsi (Luca likes to get drunk)

Usage notes

• When si is part of an infinitive, it can be placed before it as a separate word, but more often it is attached to the end. In this case, the final -e of the infinitive is dropped, or, in the case of infinitives ending in -rre, the final -re is dropped. Examples: amare + si = amarsi; ridurre + si = ridursi.

See also

• sì

Latin

Conjunction

1. if, supposing that

Derived terms

• sodes
• si minus (if not)
• nisi

Usage notes

• The conjunction si is followed by a clause with an indicative verb.

Lojban

Cmavo

si

1. (metalinguistic eraser) deletes the last word

Related terms

• sa
• su

Mandarin

Pinyin

si

1. A transliteration of any of a number of Chinese characters properly represented as having one of three tones, sī, sǐ, or sì.

Usage notes

English transcriptions of Chinese speech often fail to distinguish between the critical tonal differences employed in the Chinese language, using words such as this one without the appropriate indication of tone.

Norwegian

Etymology 1

Noun

si

1. seventh note of a major scale

Etymology 2

From segja

Verb

si (present tense sier; past tense sa; past participle sagt; present participle siende; imperative si)

1. say

Etymology 3

Synonymous with side (side)

Noun

si

1. side

Usage notes

This term is only used idiomatically in the phrase på si.

Portuguese

Etymology

se.

Pronoun

1. oneself, yourself, himself, herself, itself, yourselves, themselves.

Slovak

Verb

byť (second-person singular: si)

1. (you) are, (thou) art

Pronoun

1. Replaces the dative of a personal pronoun when the subject is of the same person as the dative object. Roughly comparable with to oneself or for oneself.

   Kupujem si topánky. — I am buying myself shoes.

   Komu kupuješ topánky? Sebe. — Whom are you buying the shoes for? Myself.

Spanish

Etymology

si.

Conjunction

1. if

See also

• si ... o

Swahili

Adverb

1. not

Volapük

Interjection

1. yes

Si, si, or SI may refer to (all SI unless otherwise stated):

In language:

• ISO 639 alpha-2 code for the Sinhalese language

In computer science:

• .si, the Internet country code top-level domain for Slovenia
• Shift In, a control code in the C0 control code set
• Swarm Intelligence, an artificial intelligence technique
• Synthetic Intelligence, a form of artificial intelligence

In education:

• Saint Ignatius College Prepatory, a Jesuit college in the United States
• Samahang Ilokano, a fraternity/sorority based in the Philippines
• Seletar Institute, a defunct centralised institute in Singapore
• Silay Institute, Inc., a private college in the Philippines
• Smithsonian Institution, an American educational and research institute

In gaming:

• Si, a self-replicating artifact in the computer game Ancient Domains of Mystery
• The Elder Scrolls IV: Shivering Isles, an expansion pack for The Elder Scrolls IV: Oblivion
• Sports Interactive, a British computer games development company

In mathematics and science:

• Signal integrity, electronic circuit tools and techniques that ensure electrical signals are of sufficient quality for proper operation
• Si, the chemical symbol for silicon
• Si(x), the sinc function in mathematics
• Si, the sine integral in mathematics
• Survey of India, an Indian government agency responsible for managing geographical information about India
• International System of Units (Système International d'Unités), the modern international standard version of the metric system
• Simple Interest (Mathematics)

In medicine:

• Sacroiliac
• Self-injury
• Sensory integration, the neurological process that organizes sensation from one's own body and the environment
  • Upper often referring to Primary somatosensory cortex
• Sexual intercourse, a medical abbreviation
• Suicidal ideation, a medical term for thoughts about suicide
• Sacroiliac, an anatomical abbreviation for the sacroiliac (joint)

In music:

• Si, the original name of the seventh note of solfege, later changed to "Ti"
• Sì (song), the name of the Italian entry to the Eurovision Song Contest 1974
• Sí (Julieta Venegas), an album by Mexican singer and songwriter Julieta Venegas

In mythology:

• Si, the lunar deity in Mahican mythology
• Si, another name for the Sídhe, Celtic mythological beings

In government and politics:

• Situationist International, a left-wing organisation
• Socialist International, a worldwide organisation of social democratic, labour, and democratic socialist political parties
• Station Inspector, the highest non-commissioned rank in the Singapore Police Force
• Statutory Instrument, a form of delegated or secondary legislation in Great Britain
• Swedish Institute (Svenska institutet), a Swedish government agency which promotes Sweden abroad

In sports:

• SÍ Sørvágur, a Faroese sports association
• Sports Illustrated, an American sports magazine

In transportation:

• IATA code for Skynet Airlines
• Reporting mark of Spokane International Railroad, a former railway in Washington, USA

Other:

• Civic Si
• Sergeant Instructor, an appointment in the British Army
• Scouting Ireland, the national Scouting association of Ireland
• Staten Island, a borough of New York City and an island in the Hudson River
• System integrator, a person or company that specialises in integrating systems
• Solomon Islands, a Pacific island nation
• Si River, a river in China
• Secret Invasion, a 2008 Marvel Comics event

See also

• S1