Etymology
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section (n.)

late 14c., seccioun, in astronomy, "the intersection of two straight lines; a division of a scale;" from Old French section and directly from Latin sectionem (nominative sectio) "a cutting, cutting off, division," noun of action from past-participle stem of secare "to cut" (from PIE root *sek- "to cut").

 The meaning "a part cut off or separated from the rest" is from early 15c. That of "a drawing representing something as if cut through" is from 1660s. From 1550s in English in the meaning "act of cutting or dividing," a sense now rare or archaic and preserved in some medical phrases, most notably Caesarian section. The meaning "a subdivision of a written work, statute, etc." is from 1570s.

Books are commonly divided into Chapters, Chapters into Sections, and Sections into Paragraphs or Breaks, as Printers call them .... [Blount, "Glossigraphia," 1656]

In music, "a group of similar instruments in a band or orchestra" (1880). In U.S. history, a square of 640 acres into which public lands were divided (1785). In World War II U.S. military slang, section eight was a reference to the passage in an Army Regulations act that referred to discharge on grounds of insanity.

section (v.)

1819, "divide (a writing) into sections;" 1891, "cut through so as to present a section;" from section (n.). Related: Sectioned; sectioning.

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Definitions of section
1
section (n.)
a self-contained part of a larger composition (written or musical);
he always turns first to the business section
the history of this work is discussed in the next section
Synonyms: subdivision
section (n.)
a very thin slice (of tissue or mineral or other substance) for examination under a microscope;
sections from the left ventricle showed diseased tissue
section (n.)
a distinct region or subdivision of a territorial or political area or community or group of people;
there are three synagogues in the Jewish section
no section of the nation is more ardent than the South
section (n.)
one of several parts or pieces that fit with others to constitute a whole object;
a section of a fishing rod
metal sections were used below ground
Synonyms: segment
section (n.)
a small team of policemen working as part of a police platoon;
section (n.)
one of the portions into which something is regarded as divided and which together constitute a whole;
the finance section of the company
Synonyms: part / division
section (n.)
a land unit equal to 1 square mile;
section (n.)
(geometry) the area created by a plane cutting through a solid;
Synonyms: plane section
section (n.)
a small class of students who are part of a larger course but are taught separately;
a graduate student taught sections for the professor's lecture course
Synonyms: discussion section
section (n.)
a division of an orchestra containing all instruments of the same class;
section (n.)
a small army unit usually having a special function;
section (n.)
a specialized division of a large organization;
she got a job in the historical section of the Treasury
Synonyms: department
section (n.)
a segment of a citrus fruit;
he ate a section of the orange
section (n.)
the cutting of or into body tissues or organs (especially by a surgeon as part of an operation);
Synonyms: incision / surgical incision
2
section (v.)
divide into segments;
Synonyms: segment
From wordnet.princeton.edu