complete the sequence: once, twice, thrice...?

Answer 1

Four times, five times. There are no unique English words for higher numbers than "thrice". Someone may write something following, but they are making it up from Latin or Greek roots.

Answer 2

Once Twice Thrice Quadruple

Answer 3

Once, twice and thrice were originally "adverbial genitives" (they were originally nouns declined for the genitive case which modified verbs) derived from Old English forms. (These days they're just analyzed as ordinary adverbs.)

once - from "ane" (1) +"s" ("-s"/"-es" is the genitive declension): "anes"
twice - from "twiga" (2) + "es": "twigaes"
thrice - from "þriga" (3) + "es": "þrigaes"

(Other modern derivatives of adverbial genitives include "nowadays", "always", "towards", and lots more. These adverbs all retain some form of the original "-es" genitive ending.)

This kind of grammar, where nouns decline for cases and take special endings to show their function and so on, is called "synthetic".
For this sequence, this is as far as the synthetic forms go. After that it becomes "analytic" - ie separate words show the function, rather than special endings.
The separate word in this case is "times", hence "four times", five times..."a hundred times" etc.

The most likely hypothesis distinct forms originally developed just for "once", "twice" and "thrice" and not the rest is because one, two and three were the most likely and very common, and therefore most used answers when asking the question "how often".

Note that "thrice" is rather archaic now, and even "twice" and "once" can be replaced with "two times" or "one time". This is because Modern English immensely prefers analytical constructions to synthetic ones.

(Icelandic is a language closely related to English which has not changed much and has remained a synthetic language, whereas English used to be highly synthetic but has changed sides to join the analytic camp. If you've ever tried studying Icelandic you'll know what a nightmare synthesis is in a language for someone who's trying to learn it as a foreign language, and how much easier it is to learn a foreign language which uses mainly analytic constructions.)

Answer 4

Four times five times and so on but I believe "thrice" is rather an old word isn't it?

Answer 5

once,twice,thrice &the second one cries

Answer 6

Ok, once, twice, thrice- three blind mice...how was that? worth 2 points...thanx!

Answer 7

once, twice, thrice are sequential degrees of quantification.

Answer 8

good question. may be the oxford english dictionary persons can think about how to form useful words rather than adding other useless words to the dictionary as part of 'ENGLISH'. I myself object to many of the words that they call English and appears part of the dictionary..

Answer 9

once, twice, thrice, quatorce . . .hello, hello ...

Answer 10

Quadruple or Quadruple times...