CS

Multiple Entries:
  CS    Cs    C    caesium  

Concise Oxford English Dictionary © 2008 Oxford University Press:
CS/siːˈɛs/

▶abbreviation Brit.

• 1 chartered surveyor.

• 2 Civil Service.

• 3 Court of Session.

Concise Oxford English Dictionary © 2008 Oxford University Press:
Cs

▶symbol the chemical element caesium.

Concise Oxford English Dictionary © 2008 Oxford University Press:
C1 (also c)

▶noun (pl. Cs or C's)

• 1 the third letter of the alphabet.

• 2 denoting the third in a set of items, categories, sizes, etc.

• 3 Music the first note of the diatonic scale of C major, the major scale having no sharps or flats.

• 4 the Roman numeral for 100. [abbrev. of L. centum ‘hundred’.]

• 5 (C) a computer programming language originally developed for implementing the Unix operating system. [formerly known as B, abbrev. of BCPL.]

Concise Oxford English Dictionary © 2008 Oxford University Press:
C2

▶abbreviation

• 1 (C.) Cape (chiefly on maps).

• 2 cargo (in designations of US aircraft types): a C-130.

• 3 Celsius or centigrade.

• 4 (in names of sports clubs) City.

• 5 (C.) Brit. Command Paper (second series, 1870–99).

• 6 (in Britain) Conservative.

• 7 (©) copyright.

• 8 Physics coulomb(s).

• 9 Cuba (international vehicle registration).

▶symbol

• 1 Physics capacitance.

• 2 the chemical element carbon.

– phrases
the Big C informal cancer.

Concise Oxford English Dictionary © 2008 Oxford University Press:
caesium /ˈsiːzɪəm/ (US cesium)

▶noun the chemical element of atomic number 55, a soft, silvery, rare, extremely reactive metal of the alkali metal group. (Symbol: Cs)

– origin C19: from L. caesius ‘greyish-blue’ (because it has characteristic lines in the blue part of the spectrum).