one sense
one series
one session
one set
one sex
one sibling
one side
one site
one size

one smoker
one source
one space dimension
one species
one specimen
one stage
one standard deviation
one state
one step
one strain

one strand
one student
one study
one subject
one subunit
one summer
one surface
one surgeon
one symptom
one system

one technique
one term
one test
one thing
one third
one time
one tissue
one tool
one tooth
one trait

one treatment
one trial
one tumor
one twin