| INVAGINATE | • invaginate adj. (Biology) sheathed. • invaginate adj. (Biology) Having one portion of a hollow organ drawn back within another portion. • invaginate v. (Medicine, surgery) To fold up or enclose into a sheath-like or pouch-like structure, either naturally… | 
| INVALIDATE | • invalidate v. To make invalid. Especially applied to contract law. • invalidate v. To make or declare (an argument, statement, or theory) unsound or erroneous; disprove. • invalidate v. To render invalid; discredit. | 
| INVALIDEST | • INVALID adj. not valid. | 
| INVALIDING | • invaliding v. Present participle of invalid. • invaliding n. (UK) The act of exempting someone from duty because of injury or ill health. • INVALIDING n. the act of treating as an invalid. | 
| INVALIDISM | • invalidism n. The condition of an invalid; sickness; infirmity. • INVALIDISM n. the condition of an invalid. | 
| INVALIDITY | • invalidity n. The state of being invalid; lack of validity. • INVALIDITY n. lack of validity or cogency. | 
| INVALUABLE | • invaluable adj. Having great or incalculable value. • invaluable adj. (Obsolete) Not valuable; worthless. • INVALUABLE adj. beyond value. | 
| INVALUABLY | • invaluably adv. In an invaluable manner; inestimably. • INVALUABLE adv. beyond value. | 
| INVARIABLE | • invariable adj. Not variable; unalterable; uniform; always having the same value. • invariable adj. (Mathematics) Constant. • invariable adj. (By extension, grammar, of a word, or a grammatical class) That cannot undergo inflection, conjugation or declension. | 
| INVARIABLY | • invariably adv. Every time; always, without change. • INVARIABLE adv. not varying, also UNVARIABLE. | 
| INVARIANCE | • invariance n. The property of being invariant. • INVARIANCE n. the state of being invariant, also INVARIANCY. | 
| INVARIANCY | • invariancy n. Alternative form of invariance. • INVARIANCY n. the state of being invariant, also INVARIANCE. | 
| INVARIANTS | • invariants n. Plural of invariant. • INVARIANT n. an invariant quantity. | 
| INVASIVELY | • invasively adv. In an invasive manner. • INVASIVE adv. intrusive. | 
| REINVADING | • reinvading v. Present participle of reinvade. • REINVADE v. to invade again. | 
| REINVASION | • reinvasion n. The act or process of reinvading; a subsequent invasion. • REINVASION n. the act of invading again. |