1. In accordance with the season
   "it was seasonably cold" 
2. At an opportune time
   - timely, well-timed, apropos

See also: seasonable

Antonym: unseasonably

• benzoic
• benzoic acid
• benzoin
• Benzoin odoriferum
• benzol
• benzoquinone
• benzoyl group
• benzoyl peroxide
• benzoyl radical
• benzyl
• benzyl group
• benzyl radical
• benzylic
• benzylpenicillin
• Beograd
• Beowulf
• Beowulf cluster
• beplaster
• bequeath
• bequeathal
• bequeathment
• bequest
• berate
• berating
• Berber