China 
Africa 
- Selenomethionine
- Selenophene
- Selenoprotein P
- Selenoproteins
- Selenourea
- Selenous acid
- Selexol
- Self accelerating decomposition temperature
- Self-adjoint
- Self-adjoint operators
- Self-aligning torque
- Self-amplified spontaneous emission
- Self-assembling peptides
- Self-assembly
- Self-assembly of nanoparticles
- Self-avoiding walks
- Self-build
- Self-cleaning
- Self-cleaning glass
- Self-cleaning surfaces
- Self-condensation
- Self-consolidating concrete
- Self-diffusion
- Self-discharge
- Self-driving cars
- Self-evident
- Self-focusing
- Self-healing
- Self-healing concrete
- Self-healing hydrogels
- Self-healing material
- Self-interference cancellation
- Self-ionization of water
- Self-limiting
- Self-management
- Self-organization
- Self-organized criticality
- Self-organizing map
- Self-phase modulation
- Self-play
- Self-propagating high-temperature synthesis
- Self-propelled particles
- Self-reference
- Self-reflection
- Self-report
- Self-selection bias
- Self-separation
- Self-service
- Self-shadowing
- Self-similarity
- Self-sufficiency
- Self-supervised learning
- Self-sustainability
- Self-tapping screw
- Self-tuning
- Sellaite
- Sellmeier equation
- Semantic
- Semantic Scholar
- Semantic Sensor Web
- Semantic Web
- Semantic Web Stack
- Semantic analysis
- Semantic data model
- Semantic dementia
- Semantic differential
- Semantic heterogeneity
- Semantic integration
- Semantic interoperability
- Semantic mapping
- Semantic matching
- Semantic networks
- Semantic parsing
- Semantic reasoner
- Semantic role labeling
- Semantic search
- Semantic security
- Semantic similarity
- Semantic space
- Semantic technology
- Semantic web services
- Semaphores
- Semaphorin
- Semi-arid climate
- Semi-automatic
- Semi-automatic transmission
- Semi-automation
- Semi-drying oil
- Semi-global matching
- Semi-infinite
- Semi-infinite programming
- Semi-log plot
- Semi-major and semi-minor axes
- Semi-major axis
- Semi-monocoque
- Semi-solid
- Semi-structured data
- Semi-submersible platforms
- Semi-submersibles
- Semi-supervised learning
- Semi-synthetic
- Semi-trailer
- Semi-trailer truck
- Semi-variable cost
- Semicarbazone
- Semicircle
- Semicircular canals
- Semiconductor detector
- Semiconductor device fabrication
- Semiconductor devices
- Semiconductor memory
- Semiconductor packages
- Semiconductor saturable-absorber mirror
- Semiconductors
- Semidefinite programming
- Semidirect product
- Semigroups
- Semilattices
- Semimartingale
- Semimembranosus
- Semimetals
- Seminal vesicle
- Seminal vesicles
- Seminiferous tubules
- Seminoma
- Seminorm
- Semiotics
- Semiparametric model
- Semipermeable membrane
- Semipermeable membrane devices
- Semiquinone
- Semirings
- Semisimple
- Semitendinosus
- Semitone
- Sensation
- Sense
- Sense amplifier
- Sense of balance
- Sense of place
- Sense of smell
- Sensemaking
- Sensible heat
- Sensitive information
- Sensitivity
- Sensitivity analysis
- Sensitivity and specificity
- Sensitivity index
- Sensitization
- Sensor arrays