The Collaborative International Dictionary of English v.0.48:

Ramp \Ramp\, n.
   1. A leap; a spring; a hostile advance.
      [1913 Webster]

            The bold Ascalonite
            Fled from his lion ramp.              --Milton.
      [1913 Webster]

   2. A highwayman; a robber. [Prov. Eng.]
      [1913 Webster]

   3. A romping woman; a prostitute. [Obs.] --Lyly.
      [1913 Webster]

   4. [F. rampe.] (Arch.)
      (a) Any sloping member, other than a purely constructional
          one, such as a continuous parapet to a staircase.
      (b) A short bend, slope, or curve, where a hand rail or
          cap changes its direction.
          [1913 Webster]

   5. [F. rampe.] (Fort.) An inclined plane serving as a
      communication between different interior levels.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ramp \Ramp\ (r[a^]mp), v. i. [imp. & p. p. Ramped (r[a^]mt;
   215); p. pr. & vb. n. Ramping.] [F. ramper to creep, OF.,
   to climb; of German origin; cf. G. raffen to snatch, LG. & D.
   rapen. See Rap to snatch, and cf. Romp.]
   [1913 Webster]
   1. To spring; to leap; to bound; to rear; to prance; to
      become rampant; hence, to frolic; to romp.
      [1913 Webster]

   2. To move by leaps, or as by leaps; hence, to move swiftly
      or with violence.
      [1913 Webster]

            Their bridles they would champ,
            And trampling the fine element would fiercely ramp.
                                                  --Spenser.
      [1913 Webster]

   3. To climb, as a plant; to creep up.
      [1913 Webster]

            With claspers and tendrils, they [plants] catch
            hold, . . . and so ramping upon trees, they mount up
            to a great height.                    --Ray.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ramp
    n 1: an inclined surface connecting two levels [syn: ramp,
         incline]
    2: North American perennial having a slender bulb and whitish
       flowers [syn: ramp, wild leek, Allium tricoccum]
    3: a movable staircase that passengers use to board or leave an
       aircraft
    v 1: behave violently, as if in state of a great anger [syn:
         ramp, rage, storm]
    2: furnish with a ramp; "The ramped auditorium"
    3: be rampant; "the lion is rampant in this heraldic depiction"
    4: creep up -- used especially of plants; "The roses ramped over
       the wall"
    5: stand with arms or forelegs raised, as if menacing