Princeton's WordNet

1. perpendicular(noun)

   a straight line at right angles to another line

2. perpendicular, perpendicular style, English-Gothic, English-Gothic architecture(noun)

   a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting

3. plumb line, perpendicular(noun)

   a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point

4. perpendicular(adj)

   an extremely steep face

5. perpendicular(adj)

   intersecting at or forming right angles

   "the axes are perpendicular to each other"

6. vertical, perpendicular(adj)

   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"; "measure the perpendicular height"

7. perpendicular(adj)

   extremely steep

   "the great perpendicular face of the cliff"

Wiktionary

1. perpendicular(Noun)

   A line or plane that is perpendicular to another.

2. perpendicular(Noun)

   A device such as a plumb line that is used in making or marking a perpendicular line.

3. perpendicular(Adjective)

   At or forming a right angle (to).

   In most houses, the walls are perpendicular to the floor

4. Perpendicular(Adjective)

   Of a style of English Gothic architecture from the fourteenth and fifteenth centuries.

   In most houses, the walls are perpendicular to the floor

Origin: perpendiculum.

Webster Dictionary

1. Perpendicular(adj)

   exactly upright or vertical; pointing to the zenith; at right angles to the plane of the horizon; extending in a right line from any point toward the center of the earth

2. Perpendicular(adj)

   at right angles to a given line or surface; as, the line ad is perpendicular to the line bc

3. Perpendicular(noun)

   a line at right angles to the plane of the horizon; a vertical line or direction

4. Perpendicular(noun)

   a line or plane falling at right angles on another line or surface, or making equal angles with it on each side

• vertikaalAfrikaans
• عَمودي، مُتَعامِدArabic
• отвесенBulgarian
• perpendicularPortuguese (BR)
• svislý; sráznýCzech
• senkrechtGerman
• lodretDanish
• κάθετοςGreek
• perpendicularSpanish
• ristloodisEstonian
• عمود؛ راستFarsi
• pystysuoraFinnish
• perpendiculaireFrench
• מְאוּנָךHebrew
• अभिलम्ब, लंबHindi
• okomit, strmCroatian
• függőleges; merőlegesHungarian
• tegakIndonesian
• lóðrétturIcelandic
• perpendicolareItalian
• 垂直のJapanese
• 수직의Korean
• statmenasLithuanian
• perpendikulārs, vertikāls, statenisksLatvian
• tegakMalay
• loodrechtDutch
• loddrettNorwegian
• prostopadłyPolish
• عمود؛ راستPersian
• تيك، نيغ، لك، عموديPashto
• perpendicularPortuguese
• verticalRomanian
• вертикальный; крутойRussian
• zvislý; strmýSlovak
• navpičenSlovenian
• uspravanSerbian
• lodrät, vertikalSwedish
• ตั้งฉากThai
• dikeyTurkish
• 垂直的Chinese (Trad.)
• перпендикулярнийUkrainian
• سيدھا، عموديUrdu
• thẳng đứng; dốc đứngVietnamese
• 垂直的Chinese (Simp.)