To be sure, it is the most common meaning, which is why it is listed first.
( ( To ( be sure ) ) ( , ( it ( ( is ( ( ( the ( ( most common ) meaning ) ) , ) ( which ( is ( why ( it ( is ( listed first ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB be) (ADJP (JJ sure))))) (, ,) (NP (PRP it)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN meaning)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (SBAR (WHADVP (WRB why)) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN listed) (ADVP (RB first))))))))))) (. .)))
The most common meaning was listed first off.
( ( The ( ( most common ) meaning ) ) ( ( was ( ( listed first ) off ) ) . ) )
(ROOT (S (NP (DT The) (ADJP (RBS most) (JJ common)) (NN meaning)) (VP (VBD was) (VP (VBN listed) (ADVP (RB first)) (PP (RP off)))) (. .)))