If the guy down the street shows you how to play the guitar and helps you develop a masterful plucking style, then he's your guitar teacher.

A teacher is anyone who teaches things. Schools hire people to be teachers, but you don't have to work in a school to be a teacher. You can be a teacher to your children. If you're really good at making pizza, you can be a teacher to an aspiring pizza chef. If you're really passionate about methods of education, then you can become a teacher who teaches teachers how to teach better. Whoa.

Definitions of teacher

n a person whose occupation is teaching

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Apostle of Germany
(Roman Catholic Church) Anglo-Saxon missionary who was sent to Frisia and Germany to spread the Christian faith; was martyred in Frisia (680-754)
David Livingstone
Scottish missionary and explorer who discovered the Zambezi River and Victoria Falls (1813-1873)
John Thomas Scopes
Tennessee highschool teacher who violated a state law by teaching evolution; in a highly publicized trial in 1925 he was prosecuted by William Jennings Bryan and defended by Clarence Darrow (1900-1970)
Marcus Whitman
United States frontier missionary who established a post in Oregon where Christianity and schooling and medicine were available to Native Americans (1802-1847)
Saint Francis Xavier
Spanish missionary and Jesuit who establish missionaries in Japan and Ceylon and the East Indies (1506-1552)
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art teacher
someone who teaches art
a teacher of or believer in Bahaism
one who instructs catechumens in preparation for baptism (especially one using a catechism)
coach, private instructor, tutor
a person who gives private instruction (as in singing, acting, etc.)
dance master, dancing-master
a professional teacher of dancing
a teacher or teacher's assistant who demonstrates the principles that are being taught
a teacher at some universities
English professor, English teacher
someone who teaches English
French teacher
someone who teaches French
a woman entrusted with the care and supervision of a child (especially in a private home)
a woman instructor
math teacher, mathematics teacher
someone who teaches mathematics
someone who attempts to convert others to a particular doctrine or program
music teacher
someone who teaches music
don, preceptor
teacher at a university or college (especially at Cambridge or Oxford)
reading teacher
someone who teaches students to read
riding master
someone who teaches horsemanship
school teacher, schoolteacher
a teacher in a school below the college level
science teacher
someone who teaches science
section man
someone who teaches a section of a large college course
teaching fellow
a graduate student with teaching responsibilities
a teacher who is paid to cram students for examinations
games-master, games-mistress
the teacher in charge of games at a school
geometry teacher
someone who teaches geometry
piano teacher
someone who teaches students to play the piano
mistress, schoolma'am, schoolmarm, schoolmistress
a woman schoolteacher (especially one regarded as strict)
Cyril, Saint Cyril, St. Cyril
Greek missionary; the invention of the Cyrillic alphabet is attributed to him (826-869)
Type of:
educator, pedagog, pedagogue
someone who educates young people

n a personified abstraction that teaches

“books were his teachers
“experience is a demanding teacher
Type of:
abstract, abstraction
a concept or idea not associated with any specific instance

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