Meaning of ALSO in English

ALSO

/ ˈɔːlsəʊ; NAmE ˈɔːlsoʊ/ adverb

(not used with negative verbs) in addition; too :

She's fluent in French and German. She also speaks a little Italian.

rubella, also known as German measles

I didn't like it that much. Also, it was much too expensive.

Jake's father had also been a doctor (= both Jake and his father were doctors) .

She was not only intelligent but also very musical.

••

WHICH WORD

also / as well / too

Also is more formal than as well and too , and it usually comes before the main verb or after be :

I went to New York last year, and I also spent some time in Washington.

In BrE it is not usually used at the end of a sentence. Too is much more common in spoken and informal English. It is usually used at the end of a sentence:

'I'm going home now.' 'I'll come too.'

. In BrE as well is used like too , but in NAmE it sounds formal or old-fashioned.

When you want to add a second negative point in a negative sentence, use not...either :

She hasn't phoned and she hasn't written either

. If you are adding a negative point to a positive one, you can use not...as well / too :

You can have a burger, but you can't have fries as well.

••

WORD ORIGIN

Old English alswā quite so, in that manner, similarly , composite of all + so .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.