This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. In due season; at an opportune or fitting time.

ad. Varying with the season.

ad. In a manner appropriate to the season.

ad. Within the appropriate time period during which an action will be legally effective, as prescribed in legislation, a contract, or otherwise.

In due time or season; in time convenient; sufficiently early: as, to sow or plant seasonably.

ad. at an opportune time

ad. in accordance with the season

"Many men may be far more ready to hear the gospel than we imagine; and a word seasonably and kindly spoken may be the means of saving them, Pr 25: 11; Ec 11: 6."