A Hiatus

1. A gap in a series, making it incomplete.
2. An interruption, break or pause.
3. (geology) A gap in geological strata.
4. (anatomy) An opening in an organ.
5. (linguistics, uncountable) A syllable break between two vowels, without an intervening consonant. (Compare diphthong.)

(gap in series): break

(interruption, break, pause): breather, moratorium, recess; pause