| A | B | 
| ideology (n) | a manner or the content of thinking characteristic of an individual, group, or culture | 
| immaterial (adj) | not consisting of matter; of no substantial consequence | 
| immunity (n) | a condition of being able to resist a particular disease especially through preventing development of a pathogenic microorganism or by counteracting the effects of its products | 
| impertinent (adj) | irrelevant; given to or characterized by insolent rudeness | 
| implement (n) | a device used in the performance of a task--tool; utensil | 
| implement (v) | carry out , accomplish ; especially : to give practical effect to and ensure of actual fulfillment by concrete measures | 
| inaudible (adj) | not audible | 
| incalculable (adj) | not capable of being calculated: as a: very great b: not predictable | 
| incandescent (adj) | a: white, glowing, or luminous with intense heat b: strikingly bright, radiant, or clear c: marked by brilliance especially of expression | 
| incessant (adj) | continuing or following without interruption | 
| incompatible (adj) | incapable of association or harmonious coexistence; unsuitable for use together because of undesirable chemical or physiological effects | 
| incomprehensible (adj) | impossible to understand | 
| inconspicuous (adj) | not readily noticeable | 
| inconvenient (adj) | not convenient especially in giving trouble or annoyance : inopportune | 
| indivisible (adj) | not divisible | 
| induction (n) | initiation; a preface, prologue, or introductory scene especially of an early English play;  the act of causing or bringing on or about | 
| incandescent (n) | lightbulb |