1. (noun) (frequently plural) an expense not budgeted or not specified

• incidental expense
• minor expense

2. (adjective) (sometimes followed by to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence

• incident

3. (adjective) not of prime or central importance

• nonessential

4. (adjective) following or accompanying as a consequence

• accompanying
• attendant
• concomitant
• consequent
• ensuant
• resultant
• sequent

1. (noun) (frequently plural) an expense not budgeted or not specified

• expense

2. (noun) an item that is incidental

• item
• point

1. (adjective) (sometimes followed by to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence

• omissible
• parenthetic
• parenthetical
• peripheral
• secondary

2. (adjective) not of prime or central importance

• inessential
• unessential

3. (adjective) following or accompanying as a consequence

• subsequent

1. (adjective) not of prime or central importance

• inessential
• nonessential

2. (adjective) following or accompanying as a consequence

• accompaniment
• attendant
• co-occurrence
• concomitant
• attend
• concomitance
• consequence
• effect
• event
• issue
• outcome
• result
• upshot
• end point
• resultant
• ensue
• result
• final result
• outcome
• result
• resultant
• termination
• lead
• leave
• result
• resultant
• vector sum

1. (adjective) (sometimes followed by to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence

• basic