什么是word?

• 一种是因为其含义无法预测而必须被写进词典的word，另一种是组成phrase和sentence的基本元素之外的其他基本元素。真实情况远比这种分类复杂
• meaning units or building blocks

一个句子中有多少word？

• 区分token和type，token是type的实例，一个句子中可能存在一个type的多个token
• 我们常说的word可能指type或者token

words with predictable meanings

• onomatopoeic words, (eg. miaow)
• sound symbolism, (eg. slip, slurp, sleek)
• the associations between words and their meanings are mostly conventional.

what words should not be listed in a dictionary?

• dioecious-ly, as its meaning is guessable, Xly means "in a X fashion"
• this means "building blocks" dose not entail "meaning unit".

2.4 Idiom

• idiom, expression whose meaning is unpredictable based on its component