The second letter is "e".
Sincere
popular
The second letter of the seven letter word meaning "one-fourth" is "u." The word is "quarter."u as in quarter
U is the second letter in the word quarter.
signals
figures
loveyou?
already
achieve
Some seven letter words with the second letter A and the third letter U are:bauxitecausticcautiondauphinhaughtyhauntedhauteurlaundrymaudlinnaughtypaunchyraucousraunchysauntersausagevaulted
u is the 2nd letter