Incorrect spelling, explanation: the form 101th is a mistake because it violates a fundamental rule of ordinal numbers in English. The suffix added to an ordinal number depends on the final digit, not the entire number: 1st for numbers ending in 1 (except for 11), 2nd for numbers ending in 2 (except for 12), 3rd for numbers ending in 3 (except for 13), -th for all other endings. Since 101 ends with the digit 1, it must take the -st suffix, making it 101st, not 101th.

Correct spelling, explanation: the word 101st combines the cardinal number 101 (one hundred and one) with the suffix -st, which derives from Old English forma (first) and Middle English firste. Over time, English developed the convention to attach specific suffixes to indicate order: -st from first, -nd from second, -rd from third and -th from later analogical extensions. Despite containing three digits, the last digit (1) in 101 triggers the use of -st, following the same rule as 1st because English focuses on the final spoken digit, not the entire numerical sequence. 101th is not correct.

Definition of 101st:
Ordinal number, the ordinal form of the number 101, used to describe the position of something in a sequence or list
The university celebrated its 101st anniversary with a gala.
The 101st issue of the magazine features an exclusive interview.

Collocations with 101st:
Some of the most commonly used collocations include:
1. 101st floor: the level or story of a tall building.
The observation deck on the 101st floor offers a stunning view of the entire city.
2. 101st meeting: refers to the 101st formal gathering of a group, organization, or board.
During the 101st meeting of the board, major policy changes were discussed.
3. 101st session: refers to the 101st occurrence of an official assembly, such as in government or international organizations.
The delegates convened for the 101st session of the UN Economic Commission.
4. 101st birthday celebration: a special event to commemorate a person reaching the age of 101.
The family organized a grand party for Grandma’s 101st birthday celebration.

Incorrect spelling

Incorrect spelling