Timelines or Timeliness: How To spell?
The word Timelines is misspelled against Timeliness, a noun meaning "The quality or state of being timely; seasonableness; opportuneness."
Timeliness has double 'ss' in the end mispronounced as 's'Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  timeline-s  Correct Spelling:  timeline-ss 
Find more wrongly spelled words of Timeliness to spell it well.