用英语说"...的意思是"

如果是提问，可用下列句型：
What do you mean by...?
What is the meaning of...?
What does...mean?
Can you explain the word...?

如果是解释，可用：
....means....

....refers to....

By....we mean....

...can be defined as....

the meaning of
the idea of

the meaning of
mean
例如：apple
1.what is the meaning of 'apple'?
2.What does 'apple' mean?

sth means...
sth implies...
it has the meaning of...