| INFRACLASS | • infraclass n. (Taxonomy) A zoological classification sometimes inserted below subclass and above subterclass (rarely… | 
| INFRACTING | • infracting v. Present participle of infract. • INFRACT v. to break a legal rule. | 
| INFRACTION | • infraction n. (Law) A minor offence, petty crime. • infraction n. A violation; breach. • infraction n. (Ice hockey) A major violation of rules which leads to a penalty, if detected by the referee. | 
| INFRACTORS | • infractors n. Plural of infractor. • INFRACTOR n. one who infracts or infringes. | 
| INFRAGRANT | • infragrant adj. Not fragrant; unfragrant. • INFRAGRANT adj. not fragrant. | 
| INFRAHUMAN | • infrahuman adj. Below the level of the human. • infrahuman n. (Psychology) A creature that is not (yet) at the level of understanding of a human being, such as a… • INFRAHUMAN adj. less or lower than human. | 
| INFRAORDER | • infraorder n. Alternative form of infra-order. • infra-order n. (Taxonomy) A taxonomic category below suborder and above superfamily. | 
| INFRAPOSED | • INFRAPOSED adj. placed below something else. | 
| INFRASONIC | • infrasonic adj. (Of sound waves, acoustics) Having frequencies below the human audible range. • infrasonic adj. (Of a device) Generating or employing such sound waves. • INFRASONIC adj. having or relating to a frequency below the audibility range of the human ear. | 
| INFRASOUND | • infrasound n. (Physics) Sound waves having a frequency below the human audible range (below about 20 Hz). • INFRASOUND n. frequencies below the usual audible limit. | 
| INFREQUENT | • infrequent adj. Not frequent; not happening frequently. • INFREQUENT adj. not frequent, also UNFREQUENT. | 
| INFRINGERS | • infringers n. Plural of infringer. • INFRINGER n. one who infringes. | 
| INFRINGING | • infringing v. Present participle of infringe. • INFRINGE v. to violate an oath or law. | 
| MAINFRAMES | • mainframes n. Plural of mainframe. • MAINFRAME n. a large computer serving others. |