What do you do when the dictionary doesn't give you a meaning that fits your sentence?
If dictionaries give various meanings, I always return to breaking down the word/phrase into its components and see if they make sense given your context:


  直 Zhí = straight, direct
  
  接 Jiē = meet, connect, join


So, it would seem that 直接 (direct connect) could mean both straightforward and relevant (hence why dictionaries give both as results). 

But to remove all ambiguity, I would try searching other better fitting words... In this case, I would use 相关 xiāng guān = interrelated 

Again, 


  相 xiāng = mutually
  
  关 guān ＝　to involve, to concern 


Some examples:


这些事情是特别相关 (Zhèxiē shìqíng shì tèbié xiāngguān) - These things are particularly relevant
相关任务间的重叠时间 (Xiāngguān rènwù jiān de chóngdié shíjiān) - Related tasks overlap time


More examples here