- performance error
- performance monitor
- performance objective
- periastron
- pericynthion
- perigon
- perilune
- perimeter
- period definition
- period meshes
- period point
- period ratio
- period strip
- periodic colineation
- periodic collineation
- periodic duration
- periodic duty
- periodic group
- periodic reports
- periodic semigroup
- periodic solution
- periodic structure
- periodical
- periodical fraction
- periodically
- peripheral equipment
- peripheral memory
- peripheral operation
- peripheral subsystem
- peripheral transfer
- Perl
- permanence
- permanence condition
- permanency
- permanent connection
- permanent file
- permanent memory
- permanent storage
- permissible action
- permission field
- permutability
- permutation group
- permutation table
- perpendicular bisector
- perpendicular planes
- perpendicular recorder
- perpendicular to
- perpetual motion
- persistence
- persistent memory
- personal information
- personal name
- personal organizer
- personal programming
- personal robot
- personal workstation
- perspective
- perspective collineation
- perspective geometry
- perspective triangles
- pertinent
- perturbation equation
- perturbed
- pessimising compiler
- petabyte
- Petri net
- Pfaffian
- pgdn
- phantom character
- phantom hyphen
- phantom target
- periodogram
- periodogram address
- peripheral buffer
- peripheral computer
- peripheral interface
- peripheral link
- peripheral processing
- peripheral unit
- peripheralstorage
- periphery
- permalloy
- permanence relation
- permanent data
- permanent fault
- permanent joint
- permanent object
- permanent variable
- permeability
- permeance
- permissible
- permission
- permission code
- permit
- permutable operation
- permutation matrix
- permutation modulation
- permutations
- perpendicular lines
- perpendicular recording