What does it mean?
  : a light vehicle with two wheels behind one another,
handlebars, a saddle seat, and pedals by which it is made to
move

How do you use it?
  Our art teacher, Mr. Scott, is an avid cyclist and he rides
his bicycle to school even in the winter.

Are you a word wiz?
  The bicycle was invented in the mid-1800s, and soon after the
word "bicycle" appeared in print for the first time. What
else do you think was invented around that same time?

  A. hovercraft
  B. chariot
  C. glider
  D. submarine

Answer: 
  You're flying high if you chose C! The bicycle dates back to
the 1830s, and within a short time the word "bicycle" entered
English. Adopted from French, "bicycle" is a combination of
the prefix "bi-," meaning "two," and Greek "kyklos," meaning
"wheel." Not long after the invention of the bicycle, a
nonpowered heavier-than-air craft capable of sustained flight
was introduced and came to be known as a "glider." This
aircraft sense of "glider" was a specific use of an already
common word. "Glider" is a descendant of Old English
"glidan," meaning "to glide," and has been used since the
15th century to mean generally someone or something that
glides.

NB: The elements of "bicycle" are Greek: 
"bi-" meaning "two", "twice"or "double" as in "bilingual", "bicentenary"
and "kyklos" meaning "circle", "something round".