From Longman Dictionary of Contemporary English:

noun [countable]

a large board with a white smooth surface that you can write on, used, for example, in rooms where classes are taught

From Longman Dictionary of Contemporary English:

noun [countable]

a special board on a wall which notices can be fastened to SYN bulletin board American English

From Longman Dictionary of Contemporary English:

verb

if you notice something or someone, you realize that they exist, especially because you can see, hear, or feel them

From Longman Dictionary of Contemporary English:

noun [countable]

a piece of furniture like a table, usually with drawers in it, that you sit at to write and work

From Longman Dictionary of Contemporary English:

noun [countable]

a piece of furniture for one person to sit on, which has a back, a seat, and four legs

From Longman Dictionary of Contemporary English:

noun [countable]

a container made of paper, cloth, or thin plastic, that usually opens at the top

From Longman Dictionary of Contemporary English:

noun [countable, uncountable] an instrument for writing or drawing with ink

From Longman Dictionary of Contemporary English:

noun [countable]

a book that students use regularly during a set of lessons on a particular subject SYN textbook

From Longman Dictionary of Contemporary English:

noun [countable, uncountable]

an instrument that you use for writing or drawing, consisting of a wooden stick with a thin piece of a black or coloured substance in the middle

Longman Dictionary of Contemporary English:

noun [countable]

a piece of furniture with a flat top supported by legs

From Longman Dictionary of Contemporary English:

noun [countable]

a book that gives a list of words in alphabetical order and explains their meanings in the same language, or another language

From Longman Dictionary of Contemporary English:

noun [countable]

(compact disc) a small circular piece of hard plastic on which high-quality recorded sound or large quantities of information can be stored

From Longman Dictionary of Contemporary English:

noun [countable]

a piece of equipment used to play compact discs

From Longman Dictionary of Contemporary English:

noun [uncountable]

material in the form of thin sheets that is used for writing on, wrapping things etc

From Longman Dictionary of Contemporary English:

noun [countable]

a book that students use for writing in