Vertical describes something that rises straight up from a horizontal line or plane. A telephone pole or a tree can usually be described as vertical in relation to the ground.

The walls of your house — unless there's some terrible problem — are vertical. They rise straight up from the foundation, at a ninety degree angle. When you're standing up, you're vertical, as opposed to when you lie down in a horizontal position on the couch. The terms vertical and horizontal often describe directions: a vertical line goes up and down, and a horizontal line goes across. You can remember which direction is vertical by the letter, "v," which points down.

Definitions of vertical
  1. adjective
    at right angles to the plane of the horizon or a base line
    “a vertical camera angle”
    “the monument consists of two vertical pillars supporting a horizontal slab”
    synonyms: perpendicular
    having a sharp inclination
    exactly vertical
    turned up on end
    unsloped, upright
    in a vertical position; not sloping
    having no deviations
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    parallel to or in the plane of the horizon or a base line
    at an angle to the horizontal or vertical position
    (of a topographical gradient) not steep or abrupt
    in the shape of (a horizontal piece on) a cross
    horizontally level
    being on a precise horizontal plane
    naiant, swimming
    applied to a fish depicted horizontally
    atilt, canted, leaning, tilted, tipped
    departing or being caused to depart from the true vertical or horizontal
    aslant, aslope, diagonal, slanted, slanting, sloped, sloping
    having an oblique or slanted direction
    set at a sharp or high angle or slant
    set at a low angle or slant
    of a geological structure in which all strata are inclined in the same direction
    set at a slant
    represented as leaping (rampant but leaning forward)
    inclining or directed to one side
    skew, skewed
    having an oblique or slanting direction or position
    slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled
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  2. adjective
    upright in position or posture
    “a column still vertical amid the ruins”
    synonyms: erect, upright
    capable of being raised to an upright position
    having clusters of erect branches (often appearing to form a single column)
    pertaining to an upright standing posture
    in walking position with right foreleg raised
    rampant, rearing
    rearing on left hind leg with forelegs elevated and head usually in profile
    of plants that are semi-climbers
    of plants that are partly erect
    of animals that are partly erect
    having a supporting base
    requiring a standing position
    standing on four feet
    straight, unbent, unbowed
    erect in posture
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    not upright in position or posture
    accumbent, decumbent, recumbent
    lying down; in a position of comfort or rest
    bended, bent
    used of the back and knees; stooped
    cernuous, drooping, nodding, pendulous, weeping
    having branches or flower heads that bend downward
    lying on the stomach with head raised with legs pointed forward
    dormant, sleeping
    (heraldry) lying with head on paws as if sleeping
    flat, prostrate
    stretched out and lying at full length along the ground
    crooked, hunched, round-backed, round-shouldered, stooped, stooping
    having the back and shoulders rounded; not erect
    having stems that trail along the ground without putting down roots
    prone, prostrate
    lying face downward
    imperfectly prostrate; prostrate for part of its length
    resupine, supine
    lying face upward
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  3. adjective
    of or relating to different levels in a hierarchy (as levels of social class or income group)
    vertical social mobility”
    hierarchal, hierarchic, hierarchical
    classified according to various criteria into successive levels or layers
  4. adjective
    relating to or involving all stages of a business from production to distribution
  5. noun
    a vertical structural member as a post or stake
    synonyms: upright
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    column, pillar
    (architecture) a tall vertical cylindrical structure standing upright and used to support a structure
    upright consisting of a vertical side member of a door or window frame
    an upright consisting of a piece of timber or metal fixed firmly in an upright position
    scantling, stud
    an upright in house framing
    scape, shaft
    (architecture) upright consisting of the vertical part of a column
    an upright that is a member in a door or window frame
    atlas, telamon
    a figure of a man used as a supporting column
    bitt, bollard
    a strong post (as on a wharf or quay or ship for attaching mooring lines)
    carrick bitt
    either of a pair of strong posts that support a windlass on a ship's deck
    a supporting column carved in the shape of a person
    corner post
    a square post supporting a structural member at the corner of a building
    doorjamb, doorpost
    a jamb for a door
    either of two posts that bound a gate
    one of a pair of posts (usually joined by a crossbar) that are set up as a goal at each end of a playing field
    hitching post
    a fixed post with a ring to which a horse can be hitched to prevent it from straying
    hop pole
    a tall pole to support the wires on which the hop plant is trained
    king post
    post connecting the crossbeam to the apex of a triangular truss
    a metal post supporting an outdoor lamp (such as a streetlight)
    a vertical pole or post decorated with streamers that can be held by dancers celebrating May Day
    the central pillar of a circular staircase
    newel, newel post
    the post at the top or bottom of a flight of stairs; it supports the handrail
    a rectangular column that usually projects about a third of its width from the wall to which it is attached
    pile, piling, spile, stilt
    a column of wood or steel or concrete that is driven into the ground to provide support for a structure
    queen post
    vertical tie post in a roof truss
    rudderpost, rudderstock
    a vertical post at the forward edge of a rudder that enables the rudder to pivot
    a strong wooden or metal post with a point at one end so it can be driven into the ground
    any vertical post or rod used as a support
    an upright pole or beam (especially one used as a support)
    (cricket) any of three upright wooden posts that form the wicket
    support column
    a column that supports a heavy weight
    telegraph pole, telegraph post, telephone pole
    tall pole supporting telephone wires
    a post made of wood
    whipping post
    post formerly used in public to which offenders are tied to be whipped
    type of:
    structural member
    support that is a constituent part of any structure or building
  6. noun
    something that is oriented vertically
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    type of:
    position or alignment relative to points of the compass or other specific directions
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