adj

• (phonetics) Of even tone; without rising or falling inflection; monotonic.
  "Intonation or tone is either level, rising, or falling, marked respectively"
• (physics) Perpendicular to a gravitational force.
  "The earth's oceans remain level in relation to the pull of gravity."

noun

• (computer science) Distance from the root node of a tree structure.
• (video games) One of several discrete segments of a game, generally increasing in difficulty and representing different locations in the game world.
  "Many of the levels change over time, from day to night or from one location to another, and some undergo a total transformation."
• (roleplaying games, video games) A numeric value given to a character (or other element of a game) that represents its relative power, challenge or eligibility to do things, used as a game mechanic to govern progression through a game.
  "My half-orc barbarian reached fifth level before he was squashed by a troll."
• (British) An area of almost perfectly flat land.
  "The troops grow mutinous—the revenue fails— There’s something rotten in us—for the level Of the State slopes, its very bases topple, The boldest turn their backs upon themselves!"

verb

• (transitive) To adjust so as to make as flat or perpendicular to the ground as possible.
  "You can level the table by turning the pads that screw into the feet."
• (transitive) To destroy by reducing to ground level; to raze.
  "The hurricane leveled the forest."
• (intransitive, roleplaying games, video games) To progress to the next level.
  "I levelled after defeating the dragon."
• (transitive) To aim or direct (a weapon, a stare, an accusation, etc).
  "He levelled an accusation of fraud at the directors.  The hunter levels the gun before taking a shot."