"One till/to four" means "one, two three and four" or "one two and three" ?
If the answer is "one, two. three and four" which word to use if you don't want to include "four" ?
I though you meant 3:59 (am or pm)!
A whole number less than 4.
Fewer than four (if there are things you can count).
One to three.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
"One till four" = 3:59, -or- from 1:00 until 4:00
"one to four" = numbers 1, 2, 3 and four, -or- one thru four.
[just my take on it :)]
Up to, but not including 4.
Context would help.