1. (adverb) at an opportune time

• seasonably
• timely
• well-timed

2. (adverb) introducing a different topic; in point of fact

• by the bye
• by the way
• incidentally

1. (adjective) of an appropriate or pertinent nature

• apposite
• apt
• pertinent

1. (adjective) of an appropriate or pertinent nature

• appropriate

1. (adjective) of an appropriate or pertinent nature

• malapropos

1. (adverb) at an opportune time

• seasonable
• timely
• well timed
• well-timed