Reciprocal (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reciprocal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for mutual that I've seen before include "Feeling for each towards the other" , "Held in common" , "Joint < commonly" , "Affecting both parties" , "given and received" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reciprocal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for alternate that I've seen before include "deputy" , "Change from one thing to another by turns" , "Change to first the one, then the other" , "In turns, first one then the other" , "Happen in turns, rotate" .)
(Other definitions for bilateral that I've seen before include "Undertaken by two parties" , "Two-sided" , "Involving two parties" , "involving more than one party?" , "involving two sides" .)
(Another definition for tit-for-tat that I've seen is " Retaliation".)