sentencecase

Sentence case is a capitalization style used in body text in English and many other languages. In sentence case, only the first word of a sentence is capitalized, and proper nouns retain their capitalization. It is often contrasted with title case and with all-lowercase styles.

In standard body text, sentence case follows a simple rule set: capitalize the first word of each sentence; capitalize proper nouns; all other words are lowercase. Some style guides also require capitalizing the first word after a colon if what follows is a complete sentence; others do not.

In headings and titles, sentence case applies the same pattern, but rules vary by style guide. Some guides capitalize proper nouns and the first word only; others may capitalize additional words for emphasis. By contrast, title case capitalizes most principal words, while all-lowercase style uses minimal capitalization.

Practical use: publishers, editors, and software often prefer sentence case for body text to improve readability and flow. In digital interfaces and natural language processing, sentence case normalization helps consistency and accessibility; many text-processing tools convert input to sentence case according to configurable rules.

Examples: The quick brown fox jumps over the lazy dog. In New York, the airport is busy. The emergency room is crowded. NASA conducts missions.