- longitudinal bracings
- longitudinal cable
- longitudinal center
- longitudinal fault
- longitudinal fishplate
- longitudinal flexibility
- longitudinal frame
- longitudinal grade
- longitudinal joint
- longitudinal key
- longitudinal member
- longitudinal reinforcement
- longitudinal restrainer
- longitudinal rib
- longitudinal rigidity
- longitudinal scale
- longitudinal seam
- longitudinal section
- lorry body
- lorry chassis
- lorry load
- lorry mixing
- lorry trailer
- lorry winch
- loss
- lounge
- louvred door
- low block
- low pilework
- low-lying
- lower bound
- lower case
- lower chord
- lower course
- lower house
- lower layer
- lower part
- lower reinforcement
- lower river
- lower-jaw
- lowering brake
- lowland moor
- lubricating gun
- lubricating system
- lubrication chart
- lubrication schedule
- long loft
- long log
- long plane
- long ton
- long wall
- long-shore
- longitudinal
- longitudinal bar
- longitudinal bracing
- longitudinal camber
- longitudinal casting
- longitudinal compression
- longitudinal displacement
- longitudinal drainage
- longitudinal elongation
- longitudinal excavation
- longitudinal grain
- longitudinal impact
- longitudinal launching
- longitudinal load
- longitudinal plane
- loss factor
- lotus capital
- loudness level
- louver frame
- louvered overhang
- louvre frame
- louvred ceiling
- love song
- low building
- low relief
- low steel
- low tide
- low vein
- low water
- low-gradient
- lot line
- louvers
- low baseboard
- low marsh
- low-pass
- lower beam
- lower boom
- lower laterals
- lowercase letter
- lowering depth
- lowering motion
- lowering partition
- lowerlock head
- lowland
- loyalty
- lubricating nipple
- lubricating unit
- luffing crane