invasiveadj/ɪnˈveɪsɪv/

• 1

  Of or pertaining to invasion; offensive.

  • The Spanyards called their invaſive fleete againſt England the Navie Invincible, yet it was overcome.
  • Oh inglorious league: / Shall we vpon the footing of our land, / Send fayre-play-orders, and make comprimiſe, / Inſinuation, parley, and baſe truce / To Armes Inuaſiue?
• 2

  governmentmilitarypoliticsThat invades a foreign country using military force; also, militarily aggressive.

  • He managed to get back Lorraine; made truce with the Hungarians, who were excessively invasive at that time. Truce with the Hungarians; and then, having gathered strength, made dreadful beating of them; two beatings,—one to each half, for the invasive Savagery had split itself, for better chance of plunder; […]
• 3

  Intrusive on one's privacy, rights, sphere of activity, etc.

  • It's wrong of me to ask such an invasive question when I keep so many secrets hidden from you.
• 4

  Originating externally.

  • All invasive moral states and passionate enthusiasms make one feelingless to evil in some direction.
• 5

  biologynatural-sciencesOf an organism: that grows (especially uncontrollably) in environments which do not harbour natural enemies, often to the detriment of native species or of food or garden flora and fauna.

  • an invasive species
• 6

  medicinesciencessurgeryOf a procedure: involving the entry of an instrument into part of the body.

  • The natural evolution of minimally invasive surgery has taken the surgeon to new heights and has extended the breadth of laparoscopic surgery to include procedures of the colon.
• 7

  medicinepathologysciencesOf a carcinoma or other abnormal growth: that invades healthy tissue, especially rapidly.

  • Two patients developed cancer in the upper urinary tract, and 3 eventually developed invasive cancer.

invasivenoun/ɪnˈveɪsɪv/

• 1

  biologynatural-sciencesAn invasive organism, such as an animal or plant.

  • Is there ever a time to plant invasives—plants that are known to spread—in the garden? I believe the answer is a qualified "yes." There is never a time to plant exotic, that is non-native, invasives. Exotic invasives such as pampas grass and French and Scottish broom were sold by local nurseries in the past, before their destructive nature was understood. […] Native invasive plants are another story: there are situations in which they can be both practical and desirable.