preceding all others in time or space or degree

a magnitude or frequency relative to a time unit

- fertility rate,
- speed,
- bits per second,
- GHz,
- sampling rate,
- words per minute,
- mortality,
- kilometers per hour,
- jerk,
- megacycle per second,
- quantitative relation,
- attrition rate,
- mph,
- flow rate,
- THz,
- flux,
- pulse rate,
- Gc,
- kph,
- fertility,
- rate of growth,
- sedimentation rate,
- fatality rate,
- pulse,
- frequence,
- frequency,
- Hz,
- rev,
- bps,
- metabolic rate,
- kilocycle per second,
- Mc,
- spacing,
- tempo,
- sed rate,
- terahertz,
- revolutions per minute,
- gigahertz,
- cycle per second,
- crime rate,
- mortality rate,
- gigacycle,
- dose rate,
- heart rate,
- MHz,
- cycles/second,
- data rate,
- rate of respiration,
- magnitude relation,
- rate of return,
- rate of flow,
- kilocycle,
- solar constant,
- rpm,
- inflation rate,
- hertz,
- rate of inflation,
- cycle,
- growth rate,
- oftenness,
- erythrocyte sedimentation rate,
- gait,
- deceleration,
- natality,
- birthrate,
- pace,
- deathrate,
- gigacycle per second,
- death rate,
- megahertz,
- acceleration,
- megacycle,
- birth rate,
- ESR,
- respiratory rate,
- wpm,
- kilometres per hour,
- kilohertz,
- kc,
- kHz,
- miles per hour,
- flow,
- km/h,
- rate of attrition,
- velocity,
- cps

amount of a charge or payment relative to some basis

- repayment rate,
- rate of depreciation,
- exchange rate,
- freight,
- linage,
- freight rate,
- payment rate,
- excursion rate,
- interest rate,
- room rate,
- charge,
- rate of pay,
- footage,
- charge per unit,
- rate of payment,
- tax rate,
- freightage,
- lineage,
- pay rate,
- rate of exchange,
- depreciation rate,
- rate of interest,
- installment rate

before anything else

the initial time

assign a rank or rating to

before another in time, space, or importance

the first or highest in an ordering or series