Summary says it really. The following are flagged as "wrong" in en-GB: 1st, 2nd, 3rd, 4th However, they are okay in en-US. See also bug 318040 for other discrepancies.
Summary: Number modifiers (st, nd, rd, th) not recognised usign en-GB dictionary → Number modifiers (st, nd, rd, th) not recognised using en-GB dictionary
This was a deliberate choice taken by the editorial team for the dictionary. It was felt that the abbreviations are too close to common short words that are easily mistyped. For example "th" is too close to "the", and in the opinion of the editors it was better to correct "the" mispelt as "th" than to accommodate "5th". If the spelling checker checked whole letter groups such as "5th" and not just the alphabetic letter within the group, the problem would be solved and we would not risk confusion with common short words. We are obviously interested in collecting further opinions on this matter, but in the meantime I propose leaving it as is. David
Based on the above, this is deliberate. Therefore marking as WONTFIX (I hope not taking too much of a liberty on this!)
Status: NEW → RESOLVED
Last Resolved: 13 years ago
Resolution: --- → WONTFIX
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