seventieth

adjective

1. next after the sixty-ninth; being the ordinal number for 70.
2. being one of 70 equal parts.

noun

3. a seventieth part, especially of one (1/70).
4. the seventieth member of a series.

adjective

1. (usually prenominal)
   1. being the ordinal number of seventy in numbering or counting order, position, time, etc: often written 70th
   2. (as noun)the seventieth in line

noun

2. 1. one of 70 approximately equal parts of something
   2. (as modifier)a seventieth part
3. the fraction equal to one divided by 70 (1/70)

adj.late 13c., from seventy + -th (1).