Reentrant

Reentrant or re-entrant can refer to:


 * Re-entrant (landform), the low ground formed between two hill spurs.
 * Reentrancy (computing) in computer programming
 * Reentrant mutex in computer science
 * Reentry (neural circuitry) in neuroscience
 * Salients, re-entrants and pockets in military tactics
 * Reentrant tuning in music
 * Concave polygon, AKA reentrant polygon