A respelling writes a pronunciation using ordinary English letters instead of phonetic symbols: serendipity is ser-uhn-DIP-i-tee. Hyphens mark syllable breaks, capitals mark the stressed syllable, and each vowel spelling always means the same sound — “oo” is always the vowel of boot, “uu” is always the vowel of book. It is less precise than IPA and readable without training, which is why every entry here carries both.
Why two notations for the same thing
IPA is exact. One symbol, one sound, no ambiguity across any language. It is also a notation you have to learn before it tells you anything, and most readers have not learned it — which makes it a pronunciation guide that does not guide.
A respelling is the opposite trade. It uses letters you already read, so it works on sight, and it pays for that with precision: it cannot distinguish sounds that English spelling has no separate letters for. Neither one is the better choice, so 35,490 entries carry both, plus the syllable line above them showing where the stress falls.
Read them together and each covers the other's gap. The syllable line shows the shape, the respelling gets you speaking, and the IPA settles any argument about which vowel is meant.
How to read a respelling
Three conventions, and then the vowel table below does the rest.