Definition of trillionth in English:

trillionth

ordinal number

  • 1Constituting number one trillion in a sequence.

    ‘the trillionth digit’
    1. 1.1informal Constituting an unspecified but very large number in a sequence.
      ‘we watch the ceremony for the trillionth time’
  • 2Each of one trillion equal parts into which something is or may be divided.

    ‘a picogram is a trillionth of a gram’
    ‘timescales of a few trillionths of a second’

Pronunciation

trillionth

/ˈtrɪljənθ/