How do you reply of Nice to meeting you?
Correct wording: Is it correct to say 'Nice to meeting you'?
Answer = No, it's not correct, because one of the reasons for using
a verb in the gerund form (ing termination) is when a verb is used
after a preposition (to, in, for etc). In 'Nice to meeting you',
the word "to" is a particle which indicates infinitive verb forms
in English (unless otherwise stated, the particle "to" has no
translations in other languages other than English). Thus, the
correct form is 'Nice to meet you'. On the other hand, we can say
'Meeting you is nice.", where meeting, in other languages (at least
Portuguese) is translated as a verb in the infinitive form (to
meet, to go, to say etc): "Conhecer você é bom" (literal
translation for 'Meeting you is nice"). Notice that when a verb is
used as a subject in a sentence, accordingly used in the beginning
of a sentence, this verb is used in the gerund in English, while it
is used in the infinitive form in other languages. (NOTE: This
question should be recategorized as "English grammar", but I don't
know how to do it.)