1. One thing at a time
   - bit-by-bit, in small stages, piecemeal, step-by-step

1. Proceeding in steps
   "the voltage was increased stepwise"
   - step by step

See also: gradual

• thermionic current
• thermionic emission
• thermionic tube
• thermionic vacuum tube
• thermionic valve
• thermionics
• thermistor
• thermo-
• thermoacidophile
• thermobaric bomb
• Thermobia
• Thermobia domestica
• thermocautery
• thermochemical
• thermochemistry
• thermocline
• thermocoagulation
• thermocouple
• thermocouple junction
• thermodynamic
• thermodynamical
• thermodynamically
• thermodynamics
• thermodynamics of equilibrium
• thermoelectric