IPA: /ˈæmplər/
KK: /ˈæmplər/
Larger in size or amount than what is usual or necessary.
The room was ampler than I expected, providing plenty of space for everyone.
Ampler is derived from the comparative form of the adjective "ample" (from Latin "amplus", meaning spacious or large) with the suffix "-er" (indicating a comparative degree). Thus, "ampler" means more ample or larger in size or extent.
Think of 'ample' meaning spacious, and remember that 'ampler' means more spacious or larger.